Atoms that have the same number of protons but a different number of neutrons. They are atoms of the same element that have different masses. The isotope number is the number of protons plus the number of neutrons. More about isotopes...
A form of any element that is identical chemically but different in physical properties from other isotopes of the sam element. Isotopes of an element have the same number of protons in the nucleus and therefore the same atomic number, but they have different numbers of neutrons in the nucleus and therefore different atomic weights. Radioactive elements may have some isotopes that are readily fissionable and others that are not.
A term applied to one of two elements, chemically identical, but differing in some other characteristic, such as radioactivity. Radioactive isotopes are often used in medicine to trace the fate of substances in the body. A to B | C to D | E to K | L to P | Q to Z
A form of an atom that differs from other forms of the atom in atomic weight. Isotopes may be stable (for example, deuterium) or radioactive (for example, tritium). Isotopes are incorporated into tracer molecules used in imaging molecular function in tiss
All atoms are made up of protons, neutrons, and electrons. Each element has a fixed number of protons: one proton for hydrogen, two for helium, three for lithium, and so on. Elements can have different numbers of neutrons. Isotopes of elements are atoms with the same number of protons, but different numbers of neutrons. Isotopes are defined by the total number of protons and neutrons, for example, deuterium has one proton and one neutron, and is an isotope of hydrogen, D = 2H; and tritium is an isotope of hydrogen with one proton and two neutrons, T = 3H.
One of two or more forms of an element that have the same number of protons (atomic number) but differing numbers of neutrons (mass numbers). Radioactive isotopes are commonly used to make DNA probes and metabolic tracers.
Atoms of the same element having the same chemical properties but differing in mass and in the physical properties that depend on their mass.
One of two or more species of the same chemical element having the same number of protons in the nucleus, but differing from one another by having different numbers of neutrons. The isotopes of an element have slightly different physical and chemical properties, owing to their mass differences.
A form of an element that contains an unusual number of neutrons in its nucleus.
Not all atoms of (say) gold have the same weight. Some gold atoms contain more neutrons than "usual", and some contain less. They're all gold, chemically, because the chemical properties are controlled by the outer electrons, and a neutron 'way down in the nucleus has no effect on electrons. Some isotopes aren't stable, and the nucleus can come apart. We call that isotope radioactive. For example Carbon 14 is radioactive, but Carbon 12 isn't. Uranium 235 is very radioactive, but Uranium 238 is only mildly radioactive. If two isotopes of one element are mixed together, it is very difficult to separate them. No chemical method works, because both isotopes have identical chemistry. Usually we use centrifuges, or else distillation. Distillation works because lighter molecules are a little quicker to evaporate.
One or more atoms of the same chemical element that differ in atomic weight because they have different numbers of neutrons. The atomic weight of the isotope is written in superscript to the left of the chemical symbol, such as 14C.
Isotopes are atoms of the same element that have different masses. This is because these atoms have different numbers of neutrons in their nuclei, although the atomic number (the number of protons in each atom) for isotopes remains the same.
A particular form of an element. The isotopes of an element have the same chemical properties but different nuclear properties. One isotope of an element may be radioactive while another isotope is stable.
(i'-so-tope) An atom of any particular element that has the same number of protons but differing numbers of neutrons in their nucleus. Carbon isotopes, for example, all have six protons in their nuclei, but carbon-12 has six neutrons, carbon-13 has seven neutrons, and carbon-14 has eighteen neutrons.
The active element characterized by energy and half-life. Iodine I-125 energy is approximately 27 keV with a 60-day half-life. Palladium Pd-103 energy is approximately 21 keV with a 17-day half-life.
One of two or more varieties of a chemical element whose atoms have the same number of protons and electrons but different numbers of neutrons.
(eye' sa tope) - One of two or more atoms with the same atomic number, but different masses.
A variant of an element that has the same number of protons but a different number of neutrons in the nucleus. Isotopes of elements have the same atomic numbers, but different mass numbers.
a variety of an element characterized by a specific number of neutrons in the nucleus.
Atoms of the same element that have equal numbers of protons but differing numbers of neutrons.
one of two or more atoms whose nuclei have equal numbers of protons but different numbers of neutrons
One of the several forms of a chemical element that have the same number of protons in the nucleus but differ in the number of neutrons and thus differ in atomic weight.
a single element can have a number of different types of nuclei that all have the same number of protons, but have different numbers of neutrons, e.g., 12C and 13C each contain 6 protons, but 12C also contains 6 neutrons and 13C contains 7 neutrons.
One of several forms of an element having the same atomic number but differing atomic masses.
chemical element that has the same atomic number as another but has a different atomic weight; radioactive isotopes change into other elements with emission of certain types of radiation
an atom of a given element that has slightly different physical and chemical properties from other atoms of the same element.
Form of an element where the number of neutrons in its atomic nucleus is different than the number of protons.
An element that has more or less neutrons than normal. Many isotopes are radioactive.
A different form of the same element, with a different number of neutrons in the nucleus.
Variation on atomic weight of an element, can be either radioactive (undergoing decay) or stable (not decaying).
Atoms of the same element may have different numbers of neutrons and therefore different masses. Atoms of the same element but with different numbers of neutrons are called isotopes of the same element.
Atoms of the same element that have different numbers of neutrons. No entries for this letter. No entries for this letter.
a compound that contains radioactive molecules bound to a sugar-like substance called glucose, which is injected into the body prior to a PET Scan.
Different versions of the same element, distinguished by the number of neutrons.
An atom with a specified number of protons and a specified number of neutrons. | Glossary home X Y Z
one of two or more atoms of an element having the same number of protons but different numbers of neutrons; having the same atomic number but different atomic masses due to a different number of neutrons. (see nuclide)
a sub-group of an element in which the atomic nucleus has the same number of neutrons, as well as, the same number of protons. All of the atoms of an element will have very nearly the same chemical properties, but the isotopes can have very different nuclear properties.
A species of nucleus with a fixed number of protons and neutrons. The term isotope is usually used to distinguish nuclear species of the same chemical element (i.e., those having the same number of protons, but different numbers of neutrons), such as iodine 127 and iodine 131.
An unstable element that decays at a constant rate.
Atom of an element with the same number of protons in the nucleus but a different number of neutrons.
of the possible varieties of atoms of a given element, having a certain number of neutrons.
a chemical which gives off a type of radioactivity called gamma rays
a different form of an atom
a form of an element with a different number of neutrons in its nucleus
a given form of an element in which the number of neutrons is known
an alternate version of a chemical element that has a different atomic mass)
an atom having a given atomic number, but different numbers of neutrons
an atom of any element with the same number of protons and electrons as all the other atoms of this particular element, but with a different atomic mass (and number of neutrons)
an atom which contains a different number of neutrons in its nucleus than some other atom of the same element
an atom with a different number of neutrons from the set number of protons
an atom with the same number of protons and electrons but a different number of neutrons from the same element
an atom with the same number of protons as another atom, but a different number of neutrons
an element having the same atomic structure, but having a different atomic weight
an element in which the difference is the number of neutrons in the nucleus
an element like Uranium which contains the same number of protons as the regular element according to the periodic table but a differing number of neutrons
an element, such as carbon or chlorine, with one or more extra neutrons in its nucleus
an element that has a specific number of neutrons in its nucleus
an element that has the same number of protons, which is the definition of an element, but may have different numbers of neutrons in the nucleus, which doesn't affect the 'chemistry' of the atom
an element with a different amount of neutrons than protons
a nuclei which is rich or deficient in the number of neutrons
a slightly different version of an element
a subset of a chemical element that has the same number of protons in the atomic nucleus, but a different number of neutrons
a variation of a chemical element
a variation of a element that has radioactive properties and can be compared to the nonradioactive type of the element to tell researchers something about the water's history
a variation of an element that is heavier or lighter than its standard form, because each atom has more or fewer neutrons in its nucleus
nuclei of the same element that have the same atomic number but different atomic mass and neutrons.
An isotope of an element has the same number of protons, but a different number of neutrons as a normal atom. Because isotopes contain more neutrons, they are heavier than normal atoms, causing them to behave slightly differently. This is why isotope ratios are important to study.
A form of a chemical element that contains the same number of protons but a different number of neutrons than other forms of the element. Isotopes are often used to trace atoms or molecules in a metabolic pathway. In NMR, only one isotope of each element contains the correct magnetic properties to be useful.
Element atom with a specific number of neutrons.
Isotopes are species of atoms of the same element with nearly identical chemical behaviour but with different mass and physical properties. For example, different isotopes of carbon and nitrogen can be found in nature.
Any of two or more species of an element in the periodic table with the same number of protons. Isotopes have nearly identical chemical properties but different atomic masses and physical properties. For example, the isotope carbon 12 has six protons and six neutrons, while the isotope carbon 13 has six protons and seven neutrons. Both have atomic number 6 (the number of protons), but carbon 13 is more massive than carbon 12 because it carries an extra neutron.
Atoms are made of protons, electrons, and neutrons (respectively, positively charged, negatively charged, and neutral particles). The isotope of a given atom contains the same number of protons and electrons, but not of neutrons. In the case of hydrogen (1 proton, 1 electron), its isotope deuterium contains an extra neutron, making its weight greater than that of hydrogen, hence its name, heavy hydrogen.
Any of two (2) or more forms of an element in which the weights differ by one or more mass units due to a variation in the number of neutrons in the nuclei.
Isotopes of a given element have the same atomic number (same number of protons in their nuclei) but different atomic weights (different number of neutrons in their nuclei). Uranium-238 and uranium-235 are isotopes of uranium.
One of several nuclides having the same nuclear charge, but different nuclear mass numbers.
Isotopes of a given element have the same atomic number, but different mass numbers. This means that they have the same number of protons and electrons, but different numbers of neutrons. Atomic Structure
Variation of a normal chemical substance which can be radioactive. Can be used to diagnose or treat cancer (for example Sr89 is an isotope of strontium used to treat bone cancer).
One of the different kinds of an atom of the same element. All atoms of an element have the same chemical properties, but the different isotopes have different weights. (The different weights are because the isotopes have a different number of neutrons.)
Any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior, but with differing atomic mass or mass number and different physical properties.
An isotope is each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element. ORIGIN 1913: coined by F. Soddy, from iso- [equal] + Greek topos 'place' (because the isotopes occupy the same place in the periodic table of elements).
A radioactive variant of a common element with a different atomic weight but equivalent atomic number. Isotopes are generally created by the fission process.
An atom of a chemical element with a specific atomic number and atomic weight. Isotopes of the same element have the same number of protons but different numbers of neutrons. Isotopes are identified by the name of the element and the total number of protons and neutrons in the nucleus. For example, plutonium-239 is a plutonium atom with 239 protons and neutrons.
One of two or more forms of a single element; the atoms of each isotope have the same number of protons but different numbers of neutrons in their nuclei. Thus isotopes have the same atomic number but differ in atomic mass.
atoms of the ssame element that have diiferent numbers of nuetrons.
One of two or more atoms in a chemical element that have the same number of protons, but a different number of neutrons, and therefore a different atomic mass. For example, the oxygen in water can have two isotopes or "flavours," 16 and 18. By looking at a ratio of the two isotopes, scientists can determine the age of an ice core.
a different form of a chemical element having similar properties
One of a group of nuclides with the same number of protons but different numbers of neutrons. (e.g. 11H, 21H, 31H are isotopes of hydrogen. 11H is called protium or light hydrogen , 21H is called deuterium ( D2) or heavy hydrogen, 31H is called tritium; U-238 (consists of 92 protons and 146 neutrons) and U-235 (consists of 92 protons and 143 neutrons) are isotopes of Uranium).
An atom of an element having the same number of protons in its nucleus (and therefore the same atomic number), but a different number of neutrons (and therefore a different mass number). All isotopes of an element have identical chemical properties.
any atom of an element, differentiated from a common form of the element by having a different number of neutrons in the nucleus. An atomic mass as noted on the periodic table (for most elements) is a weighted average of all the naturally occuring isotopes of that element, explaining why elements generally do not have a round mass figure.
Form of a chemical element differing in nuclear mass.
An atom having the same number of protons in its nucleus as other varieties of the element but has a different number of neutrons.
One of two or more atoms with the same number of protons, but different numbers of neutrons, in the nuclei.
a nuclide of an element having the same number of protons but a different number of neutrons.
A form of a chemical element with the same atomic number as another element but having a different atomic mass. Isotopes are used in a number of medical tests. See the entire definition of Isotope
atoms of the same element having the different masses.
Elements having an identical number of protons in their nuclei but differing in their number of neutrons.
Every element comes in multiple varieties, called isotopes. Each isotope has the same number of protons (positively charged particles), but a different number of neutrons (electrically neutral particles).
Isotopes of atoms are atoms with the same number of protons and electrons but different number of neutrons. Adding neutrons to atoms does not affect charge, but it will affect atomic mass. This is why atomic mass is not reported as a whole number on the periodic table. Elements exist as a group of different isotopes. ( www.studyisland.com) Two nuclei of the same element which have the same atomic number but different masses. They contain the same number of protons but a different number of neutrons. Uranium-238 contains 92 protons and 146 neutrons while the isotope U-235 contains 92 protons and 143 neutrons. Thus the atomic weight (atomic mass) of U-238 is three higher than of U-235. www.anlw.anl.gov/anlw_history/glossary.html
One of two or more, radioactively stable ot unstable atomic species of chemical element. Isotopes have the same number of protons in the nucleus but a different number of the neutrons. Actively used for the dating of the rocks and for the reconstruction of the geochemical and biogeochemical processes of the geological past.
Atoms of an element that contain different numbers of neutrons.
An atom having the same number of protons but a different number of neutrons in its nucleus.
Isotopes are two or more nuclides with the same atomic number but different mass number .
The radioactive source (palladium-103 or iodine-125) inside the brachytherapy seed that is placed inside or near the tumor.
A form of a specific element that has the same number of protons, but differs in the number of neutrons; forms of the same element that have different mass numbers.
A particular atom of an element that has the same number of electrons and protons as the other atoms of the element, but a different number of neutrons. The temperature at which an oxygen-bearing geologic material formed can be determined by studying the oxygen isotope it contains.
Units of various atomic weights within the same element, the variable being the number of neutrons in the nuclei. Isotopes have the same chemical properties Linear Energy Transfer (LET) The energy transferred per unit length of a particle track
One of two or more variations of the same chemical element, differing in the number of neutrons not the number of protons.
A substance having a different mass to the naturally occurring element
One of two or more forms of a chemical element having the same number of protons but a different number of neutrons. All isotopes of the same element have the same chemical properties, and therefore cannot be separated by chemical means.
Isotopes of an element have the same number of protons in their nuclei, and hence represent the same element, but they differ in the number of neutrons and therefore in mass number.
Isotopes of a given element have the same atomic number (same number of protons in their nuclei) but different mass numbers (different number of neutrons in their nuclei). 238U and 235U are isotopes of uranium.
Atoms of the same element that have the same number of protons (and hence the same chemical properties), but a different number of neutrons, and therefore, different atomic weights.
form of an element with a certain number of neutrons, for example carbon exists in three isotopes: C12, C13, and C14. Some isotopes are naturally unstable and spontaneously decay at a fixed rate; other isotopes are stable.
The term isotope defines atoms that have the same number of protons but a different number of neutrons; that is, they are atoms of the same element that have different masses. Their atomic number (proton number) is the same, but their mass numbers (the total number of protons and neutrons in the nucleus) vary. Forms of the same element having identical chemical properties but differing in their atomic masses and in their nuclear properties.
Atoms having the same number of protons but a different number of neutrons. Two isotopes of the same atom are chemically similar to each other, and therefore difficult to separate, but may have different nuclear properties. Isotopes are designated by their atomic mass numbers (total number of protons and neutrons). Uranium 235 and uranium 238 are isotopes.
One of two or more species of the same element that differ in their mass numbers because of differing numbers of neutrons in their nuclei.
One of two or more atoms having the same number of protons in its nucleus, but a different number of neutrons and, therefore, a different mass.
An atom with a the wrong number of neutrons.
isotopic; isotopy. Compare with isomer, allotrope, isobar, and isotone. Atoms or ions of an element with different numbers of neutrons in their atomic nucleus. Isotopes have the same atomic number but different mass number. Isotopes have very similar chemical properties but sometimes differ greatly in nuclear stability.
Atoms of an element with the same number of protons and electrons but different numbers of neutrons. Radioactivity
An isotope is one of two or more atoms of the same chemical element that have the same number of protons in their nucleus but different numbers of neutrons. Most elements in nature consist of a mixture of isotopes. Example: hydrogen is known to have three isotopes - hydrogen (1 proton, no neutrons), deuterium (1 proton, 1 neutron), and tritium (1 proton, 2 neutrons).
One of two or more atoms having the same atomic number but differing in atomic weight and mass number. The concept of isotope was introduced to explain aspects of radioactivity. A radioactive isotope or radioisotope is a natural or artificially created isotope of a chemical element having an unstable nucleus that decays, emitting alpha, beta, or gamma rays until stability is reached. If the word you are looking for is not in our imaging encyclopaedia, please email us with a word recommendation. If the word you are looking for is not in our imaging encyclopaedia, please email us with a word recommendation. If the word you are looking for is not in our imaging encyclopaedia, please email us with a word recommendation. If the word you are looking for is not in our imaging encyclopaedia, please email us with a word recommendation.
Different forms of atoms of the same element that have different numbers of neutrons in their nuclei. An element may have a number of isotopes. For example, the three isotopes of hydrogen are protium, deuterium, and tritium. All three have one proton in their nuclei, but deuterium also has one neutron, and tritium has two neutrons.
Two atoms are isotopes if they have the same number of protons and electrons, but a different number of neutrons.
Atoms having the same number of protons in their nuclei, and hence the same atomic number and element, but differing in the number of neutrons, and therefore in the mass number. All isotopes of an element have identical chemical properties. The term should not be used as a synonym for nuclide.
the name of elements that have the same number of protons and equal chemical properties, but different number of neutrons, that is different atomic weight.
two atoms of the same element which differ only in the number of neutrons that each contains.
One of two or more atoms with the same atomic number but with different numbers of neutrons.
Atoms of the same element (that is, having the same number of protons) but with different numbers of neutrons. Some are stable, others are unstable and radioactive (see radioisotope).
A form of an atom. Isotopes can be either stable or radioactive.
One of two or more atoms than has the same number of protons in their nucleus, but a diverse number of neutrons and, therefore, a diverse mass.
A variation of an element that has the same atomic number of protons but a different weight because of the number of neutrons. Various isotopes of the same element may have different radioactive behaviors, some are highly unstable..
A form of a particular chemical element determined by the number of neutrons in the atomic nucleus. An element may have many stable or unstable (radioactive) isotopes.
An atom with the same number of protons, but a different number of neutrons in their nuclei.
Any one of two or more forms of the same element with different atomic weights, i.e., with different numbers of neutrons.
An atomic form of an element having a particular number of neutrons. Different isotopes of an element have the same number of protons but different numbers of neutrons and hence different atomic mass, eg. U-235, U-238. Some isotopes are unstable and decay (qv) to form isotopes of other elements. Light water: Ordinary water (H20) as distinct from heavy water.
Nuclides with the same number of protons but different numbers of neutrons. Not a synonym for nuclide.
One of two or more atoms that have the same atomic number but different atomic weights.
An atom of a given element having more or fewer neutrons than usual in the nucleus resulting in varing masses, not effecting the basic behavior for that given element.
Any of two or more forms of a chemical element having the same number of protons in the nucleus and hence same atomic number, but different number of neutrons [ edit][ edit][ edit
One of two or more atoms or elements which have the same atomic number (occupy the same position in the periodic table) but which differ in other respects such as atomic weight and number of neutrons in the nucleus.
An isotope of an element is another form of the same element, that has a different number of neutrons in the nucleus (giving it a different atomic weight).
An atom that shares the same atomic number and position as other atoms in an element but has a different number of neutrons and thus a different atomic mass.
Chemical term describing alternative forms of the same element, differing by the number of neutrons in the nucleus. Isotopes of the same element only differ in their masses and usually have very similar chemical properties. Small differences in chemical reaction rates may be associated with the differing masses - the kinetic isotope effect; such effects are usually of the order of 1% or less but can be as large as a factor of 7 for transfer of hydrogen/deuterium.
A chemical element is characterised by the number of protons in its atomic nucleus. Isotopes are atoms of the same element, i.e. with the same number of protons, but with different numbers of neutrons. Isotopes have the same atomic number but differ in their mass number.
(Isotope) Atoms of the same element (i.e. having the same atomic number) which differ in mass number are called isotopes of that element. The isotopes of an element are identical in chemical properties, and in all physical properties except those determined by the mass of the atom. The different isotopes of an element contain different numbers of neutrons in their nuclei. Nearly all elements found in nature are mixtures of several isotopes.(Uvarov, E. B., d. R. Chapman, and A. Isaacs. A Dictionary of Science. Third Edition. Penguin Books Ltd., Harmondsworth, England, 1966.
Isotopes are any of the several different forms of an element each having different atomic mass (mass number). Isotopes of an element have nuclei with the same number of protons (the same atomic number) but different numbers of neutrons. Therefore, isotopes have different mass numbers, which give the total number of nucleons—the number of protons plus neutrons.