The nucleus (atomic nucleus) is the centre of the atom. It's made up of particles called protons and neutrons, and surrounded by particles called electrons.
Concentrated, positively charged matter at the center of an atom; composed of protons and neutrons.
A tiny structure at the center of an atom, containing almost all the mass of the atom. Consists of protons and neutrons.
The nucleus is the small, massive center of the atom, containing neutrons and protons bound together by the nuclear force, the strongest force known in nature. The diameter of the nucleus is about (10 to the power of - 12) cm, which is about one ten-thousandth of the diameter of the atom itself.
( pl. nuclei) The core of an atom, consisting of at least one proton (i.e., the nucleus of the hydrogen atom) or of protons and neutrons. The number of protons determines the nature of the atom: The nucleus of hydrogen has one proton, that of helium has two protons, that of carbon has six protons, etc.
See Nucleus below.
The core of an atom, composed of protons and neutrons.
nucleus; nuclei; atomic nuclei. A tiny, incredibly dense positively charged mass at the heart of the atom. The nucleus is composed of protons and neutrons (and other particles). It contains almost all of the mass of the atom but occupies only a tiny fraction of the atom's volume.
The tiny center of the atom with almost all its mass in the form of protons and neutrons (p. 39-40). Plural is atomic nuclei. Also go to page 44, read the last sentence of the fifth paragraph, and do what it says.
The positively charged core of an atom consisting of protons and (except for hydrogen) neutrons, and around which electrons orbit.
The nucleus of an atom is the very small dense region, of positive charge, in its centre consisting of nucleons (protons and neutrons). The size (diameter) of the nucleus is in the range of 1.6 fm (for a proton in light hydrogen) to about 15 fm (10-15 m) (for the heaviest atoms, such as uranium). These dimensions are much smaller than the size of the atom itself by a factor of about 23,000 (uranium) to about 145,000 (hydrogen).