atomic nucleus
nucleus or center of an atom | ||||
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Atomic nucleus definition was found in categories: Science & Technology(3) Encyclopedia(1)
Atomic nucleus Definition from Science & Technology Dictionaries & Glossaries
| ASTRONOMY UNBOUND |
Atomic nucleus
. The tiny central region of an atom within which the bulk of it mass is contained. The nucleus is held together by the strong nuclear force and consists of the fundamental particles, protons and neutrons. See also element , isotope .
. The tiny central region of an atom within which the bulk of it mass is contained. The nucleus is held together by the strong nuclear force and consists of the fundamental particles, protons and neutrons. See also element , isotope .
| Energy Glossary |
ATOMIC NUCLEUS
The positively charged core of an atom.
The positively charged core of an atom.
| General Chemistry Glossary |
atomic nucleus (nucleus; nuclei; atomic nuclei)
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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.
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.
Atomic nucleus Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Atomic nucleus
The nucleus of an atom is the very small dense region of an atom, in its center consisting of nucleons (protons and neutrons). The size (diameter) of the nucleus is in the range of 1.6 fm (10-15 m) (for a proton in light hydrogen) to about 15 fm (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). Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus with a very small contribution from the orbiting electrons. The etymology of the term nucleus is from 1704 meaning “kernel of a nut”. In 1844, Michael Faraday used the term to refer to the “central point of an atom”. The modern atomic meaning was proposed by Ernest Rutherford in 1912. The adoption of the term “nucleus” to atomic theory, however, was not immediate. In 1916, for example, Gilbert N. Lewis stated, in his famous article The Atom and the Molecule, that “the atom is composed of the kernel and an outer atom or shell”.
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