Atomic nucleus
Atomic nucleus
The Atomic nucleus (pronounced: /əˈtɒmɪk ˈnjuːkliːəs/) is the small, dense region consisting of protons and neutrons at the center of an atom.
Etymology
The term "Atomic nucleus" comes from the Latin word 'nucleus' meaning 'kernel' or 'core', and the Greek word 'atomos' meaning 'indivisible'. It was first used in the early 20th century to describe the central part of the atom.
Definition
The atomic nucleus is the very dense region at the center of an atom. It is composed of two kinds of subatomic particles: protons and neutrons. Protons carry a positive electrical charge, while neutrons carry no electrical charge. The atomic nucleus is held together by the strong nuclear force.
Related Terms
- Proton: A subatomic particle found in the nucleus of every atom. It carries a positive electrical charge.
- Neutron: A subatomic particle found in the nucleus of most atoms (except Hydrogen-1). It carries no electrical charge.
- Strong nuclear force: One of the four fundamental forces in nature, it is responsible for holding the atomic nucleus together.
- Atom: The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.
- Subatomic particle: A particle smaller than an atom, such as a proton, neutron, or electron.
See Also
External links
- Medical encyclopedia article on Atomic nucleus
- Wikipedia's article - Atomic nucleus
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