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Atomic nucleus

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atomic nucleus
nucleus or center of an atom

Wikipedia English The Free Encyclopedia

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Atomic nucleus
The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment. After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud. Protons and neutrons are bound together to form a nucleus by the nuclear force.

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ASTRONOMY UNBOUND Dictionary

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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 .

General Chemistry Glossary

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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.

Free English-Vietnamese Dictionary

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atomic nucleus
atomic nucleus
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