The simplest or fundamental principles of any system in philosophy, science, or art; rudiments; as, the elements of geometry, or of music.
One of the simple substances, as supposed by the ancient philosophers; one of the imaginary principles of matter.
The elements of the alchemists were salt, sulphur, and mercury.
Compare with compound and mixture. An element is a substance composed of atoms with identical atomic number. The older definition of element ( an element is a pure substance that can't be decomposed chemically) was made obsolete by the discovery of isotopes.
Elements are substances which consist of the same kind of atom atoms. There are 92 different naturally occuring elements. Hydrogen with an atomic number atomic number of 1 is the lightest and uranium (atomic number 92) the heaviest.
All the atoms with the same atomic number.
a substance that cannot be decomposed; each chemical element is characterized by the number of protons in the nucleus.
A substance consisting entirely of atoms of the same atomic number.
A substance that cannot be reduced to any simpler set of components through chemical processes. An element is defined by the number of protons in its nucleus.
a substance that is composed of one type of atom. An element cannot be chemically separated.
Term coined by Robert Boyle in the early 1600's. Defined as a substance that can not be broken down any further by chemical means. See also: atom, atomos, Boyle, Robert, Briefing Room
a pure substance that cannot be broken down into simpler substances by ordinary chemical changes
An element is a substance which cannot be broken down into simpler components by chemical means. There are 92 naturally occurring elements in the universe, familiar examples of which include copper, iron, carbon, lead, uranium etc. Elements may be gases, solids or liquids. (See Elements, Atoms and Isotopes)
All atoms of an element have the same atomic number, the same number of protons and electrons and so the same chemical properties. The periodic table
The simplest chemical substances that combine to form more complex materials.
An atom with a unique number of protons in its nucleus. Oxygen has eight protons in its nucleus, and plutonium has 94.
A pure substance which has never been decomposed into two or more other pure substances.
A pure substance that can not be broken down into other substances by chemical reactions. Some examples are hydrogen, oxygen and carbon.
Substance of atoms, component, the making of a compound.
Any of the 109 substances that cannot be broken down further without changing its chemical properties. Singly or in combination, the elements constitute all matter.
The classification of atoms. The different atoms are grouped as elements, which distinguishable properties are specified for each one. An element can also refers to a substance whose structure is made up of only a single type of atom. A form of matter that cannot be broken down into a chemically simpler form by heating, cooling, or chemical reactions. There are 115 known elements, 92 of them natural and 23 man-made. Elements are represented by one- or two-letter abbreviations. The periodical table of the elements is a layout of all the elements.
The fundamental forms of matter.
A substance composed of atoms having an identical number of protons in each nucleus. An element cannot be separated into simpler substances by chemical means. A trace element is one present in only small quantities, less than 0.1 percent by weight.
An element is matter that is made of only one type of building block or atom. An element cannot be decomposed into simpler substances by ordinary chemical means. Only a small number of elements exist; 110 different elements are known at this time. Examples of elements include carbon, iron, hydrogen, sodium, and uranium.
A basic type of matter. Each element has distinct chemical properties. There are 92 different elements that are found in nature.
(el'-e-ment) One of the 116 to 118 presently known fundamental substances that consist of atoms of only one kind, and that singly or in combination constitute all matter. The most recently discovered elements are artificially produced by atomic collisions of atomic particles in cyclotrons, and exist for only fractions of a second before decaying to other elements.
a substance made of all the same type of atoms
A substance that cannot be decomposed into simpler substances. In an element, all the atoms have the same number of protons or electrons, although the number of neutrons may vary. Jump to top
A fundamental substance in which all atoms have the same number of protons.
An element is the most basic atomic building block. However, atoms are made from smaller subatomic particles. Each element, such as helium or hydrogen, has a unique number of protons. A neutrally charged element has the same number of electrons, but an ion has more or less electrons than protons. An isotope is an element with a different number of neutrons.
molecule composed of one type of atom. Chemists have recognized or created 112 different types of elements. See the following WWW link for the chemical description of these different elements. Two or more different elements form a compound.
That of which anything is in part compounded, which exists in it, and which is itself not decomposable into parts of different kinds.
Atoms all having the same number of protons in the nucleus.Such atoms all have the same chemical properties.
A pure substance which cannot be broken down into anything simpler by chemical means.
A substance that cannot be separated into simpler substances by chemical means. Elements, of which there are now 103 known, are combined to produce materials called compounds. Water consists of two elements, oxygen and hydrogen.
substance that cannot be changed into a simpler substance under normal laboratory conditions; a substance whose atoms have the same number of protons in the nucleus; elements are fundamental chemical substances from which all other substances are made.
A substance made up of only one type of atom. For more information see our Back to basics topic, Atoms and molecules.
A substance composed of atoms all with the same atomic number. A substance that cannot be split chemically into smaller substances.
It is the classification of atoms. The different atoms are grouped as elements with its distinguishable properties specified for each one. Element sometimes also refers to a substance with only a single type of atom in its structure, like copper, made with no other substance. It is known as element. Periodical table of elements is the layout of all the elements.
(1) One of the 109 presently known kinds of substances that comprise all matter at and above atomic level. (2) A filter grid.
A substance which cannot be broken up into simpler substances by a chemical reaction. There are about 103 elements presently known arranged in the Periodic Table.
material made up of all one kind of atom.
A substance that cannot be decomposed into a simpler substance by a chemical reaction. A substance composed of only one kind of atom.
One of the distinct, basic varieties of matter occurring in nature which, individually or in combination, compose substances of all kinds. Approximately ninety different elements are known to exist in nature and several others, including plutonium, have been obtained as a result of nuclear reactions.
A form of matter that cannot be broken down into simpler substances. Elements exist in nature as solids, liquids, or gases.
A form of matter that cannot be broken down into a chemically simpler form by heating, cooling, or chemical reactions. There are 115 known elements, 92 of them natural and 23 man-made. Elements are represented by one- or two-letter abbreviations. See also atom, atomic number.
the simplest kind of homologous substance that cannot be decomposed by chemical means.
a material that cannot be simplified or broken down any further; it consists of only one type of atom (i.e., hydrogen, oxygen, potassium).
One of 106 presently known kinds of substances that comprise all matter at and above the atomic level. (See Periodic Table)
A substance which cannot be separated into its constituent parts and still retain its chemical identity. For example, sodium (Na) is an element.
Symbol for nucleus with atomic number Z.
An element is characterized by a particular type of atom. The number of protons an atom contains determines its chemical properties.
A component of the periodic table; a pure substance that cannot be separated into simpler substances by chemical means.
A substance formed of atoms of only one type. There are just over 100 known elements in the universe, listed in the Periodic Table.
Substance consisting of only one type of atom.
a pure substance that cannot be broken down into any simpler substances by chemical means
One of 105 particular and unique chemical building blocks, that cannot be reduced to anything simpler by chemical means. Composed of neutrons, electrons, and protons.
A substance comprising atoms with exactly the same properties.
1) all isotopes of an atom that contain the same number of protons. For example, the element uranium has 92 protons, and the different isotopes of this element may contain 134 to 148 neutrons. 2) In a reactor, a fuel element is a metal rod containing the fissile material.
a substance that cannot be decomposed into simpler substances by chemical or physical means. It consists of atoms all having the same atomic number.
One of the 105 known chemical substances that cannot be divided into simpler substances by chemical means. All isotopes of an element have the same atomic number (number of protons) but have a different number of neutrons.
A substance made up of atoms bearing an identical number of protons in each nucleus.
A pure substance consisting of atoms containing a characteristic number of protons. 32
(composed of identical atoms) elements are electrically neutral. The number of protons in nucleus is identical to number of electrons.
A subtance such as iron, oxygen, and gold which cannot be separated or broken down by ordinary chemical methods
A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions.
The purest type or form of a substance
A basic building block of matter that cannot be broken down into a simpler substance by ordinary means.
Atomic material such as carbon or nickel.
Matter made up of one particular atom. The number of protons in the nucleus of the atom determines which element it represents.
A substance which has the same number of protons; the basic building block of the periodic chart.
Matter that cannot be separated into something simpler than itself by ordinary chemical means. Examples: hydrogen, helium, carbon, oxygen, nitrogen, plutonium
A substance composed of atoms with the same atomic number; cannot be broken down in ordinary chemical reactions.
A substance composed of atoms having the same number of protons in each nucleus.
a pure substance that cannot be broken down into other pure substances.
a substance consisting of a single type of atom, e.g., strontium (Sr)
Any of the four substances, air, water, fire, and earth formerly believed to compose the physical universe, usually used to describe weather conditions.
Any of over a hundred fundamental materials containing only one kind of atom. Some common elements are oxygen, gold, hydrogen, and silicon. All other materials are made of compounds or mixtures of elements. Water, for example, is made of two hydrogen atoms attached to one oxygen atom.
A substance which cannot be split into simpler substances by a chemical reaction. An element is a substance that consists of the same type of atoms. For example the element oxygen contains only oxygen atoms, whereas the compound water contains atoms of the elements oxygen and hydrogen bonded together.
Matter composed of atoms that all have the same atomic number (protons).
Material made of a single kind of atom, all of which have a particular number of protons and electrons. Hydrogen has one proton and one electron. Helium has two. Carbon has six, and iron has 26 protons and 26 electrons. Use the "back" button to return to the lesson.
refers to any substance that cannot be separated by chemical means into two or more simpler substances.
any substance that cannot be broken up into simpler substances by chemical means (Currently 115 elements have been observed and are displayed on the Periodic Table of Elements. Gold, silver, iodine, oxygen and nickel are examples of elements.)
Within an element, all of the atoms are the same and peculiar to that element. Elements may join to form molecules, and molecules to form particular mineral structures. Some elements are found pure, as minerals in their own right. Examples are sulphur, carbon (as graphite or diamonds), silver and gold.
A substance composed of only one kind of atom. These combine to compose all materials.
One of the parts, substances, or principles that make up a compound or complex whole.
An element is a substance, which cannot be split up into simpler substances by chemical means.
A substance that cannot be decomposed, by chemical means, into simpler substances.
any of more than 100 fundamental substances that consist of atoms of only one kind and that singly or in combination constitute all matter.
any of more than 100 fundamental substances that consist of atoms of only one kind. Single types of element or elements in combination constitute all matter in the known universe.
An element is a natural substance that cannot be separated into smaller parts. For example, gold is an element; it contains nothing but gold. Water is not an element; it is made up of two elements: hydrogen and oxygen. Most elements are either gases or minerals. There are 109 elements, which combine in various ways to form everything in the world.
one of more than 100 substances known to science that cannot be separated into other substances
A material consisting of atoms, all with the same atomic number. Approximately 90 different elements are known to exist in nature and several others have been created in nuclear reactions. For more information about the elements, see the Periodic Table of the Elements.
A substance made of only one kind of atom.
a fundamental substance that can't be broken down chemically into simpler substances
Chemical, such as hydrogen (H), iron (Fe), sodium (Na), carbon (C), nitrogen (N), or oxygen (O), whose distinctly different atoms serve as the basic building blocks of all matter. There are 92 naturally occurring elements. Another 23 have been made in laboratories. Two or more elements combine to form compounds that make up most of the world's matter. Compare compound.
substances which cannot be broken down into other substances
a substance which cannot be further subdivided by chemical methods.
A substance made of one type of atom only. Radioactivity
A substance which cannot be decomposed by chemical means into a simpler substance.
one of a class of substances that cannot be separated into simpler substances by chemical means
One of the substances supposed to make up all things
One of the 103 chemical substances that cannot be divided into simpler substances by chemical means. For example, hydrogen, magnesium, lead, and uranium are all chemical elements. Trace elements are chemical elements that are required in very small (trace) amounts in the diet to maintain health. For example, copper, selenium, and iodine are considered trace elements.
elements are substances which are in their purest form. They cannot be taken apart by normal chemical means and they cannot be made by combining two chemicals.
A fundamental substance: one that cannot be broken down into other substances by ordinary chemical means. Nuclear reactors can change one element into another by altering its nuclear structure.
One of the simple substances of which all matter is made. i.e. Oxygen or Iron.
A substance composed of atoms with a unique number of protons in each nucleus. There are 92 naturally occurring and 15 man-made elements.
A substance that is made of atoms with the same chemical properties, and which cannot be decomposed chemically into simpler substances.
An element is a substance that cannot be split into simpler substances by chemical means. An example is hydrogen (H). Hydrogen contains hydrogen and only hydrogen. It cannot be split into anything simpler, no matter what chemical changes it undergoes. IF YOU CAME HERE FROM A DIFFERENT PAGE, CLICK ON THE BACK BUTTON TO GO BACK TO THE PAGE YOU WERE VIEWING.
a basic chemical substance in which all the atoms are the same, and different from the atoms of any other substance.
One of the 100 or so chemical substances that cannot be decomposed into anything simpler.
one substance that all thing are made of
A substance with atoms all of the same atomic number.
A substance that cannot be broken down into different kinds of matter. For example, water is composed of the elements oxygen and hydrogen.
A generic term denoting all the various kinds of atoms; all atoms of the same kind--an element--have identical chemical properties and the same number of protons in each atomic nucleus.
A substance that consists of only one kind of atom and which cannot be decomposed into simpler substances by ordinary chemical means.
An element is a broad term with little in the way of specific semantics and refers to an atomic constituent of a model.
One of less than 118 pure chemical substances. An element is a substance composed of atoms with identical atomic number.
A basic fundamental substance that cannot, under normal conditions, be broken down into another substance. It consists of just one type of atom, for example, Nitrogen, Oxygen.
Atomic unit of meaning in XML.
The simplest form of a substance and the basic building block of chemistry.
1. Part of a whole. 2. Any of the four substances (earth, air, fire, water) formerly believed to constitute all physical matter. 3. Basic substance (oxygen, hydrogen, carbon), which cannot be made into a simpler substance through chemical reaction. 4. Electronic device.
One of the unique substances that make up the known universe. Each element is characterized by a unique atomic structure.
A substance composed of a particular kind of atom. All atoms with the same number of protons (atomic numbers) in the nucleus are examples of the same element and have identical chemical properties. For example, gold (with 79 protons) and iron (with 26 protons) are both elements, but table salt is not because it is made from two different elements: sodium and chlorine. The atoms of a particular element have the same number of protons in the nucleus and exhibit a unique set of chemical properties. There are about 90 naturally occurring elements on Earth.
An element is a chemically pure substance composed of atoms of a single type.