| isotope | has definition An atomic nucleus having the same number of protons as a more commonly found atomic nucleus but a different number of neutrons. For example, the hydrogen nucleus has a single proton; deuterium has one proton and one neutron and would be called an isotope of hydrogen. (see neutron; proton.) |  |
| has definition Two nuclei with the same number of protons but different numbers of neutrons are said to represent the same element, but different isotopes. For example, helium-3, with two protons and one neutron in each nucleus, and helium-4, with two protons and two neutrons, are two different isotopes of helium. For another example, see deuterium. | |
| is a kind of nucleus | |
| nucleus | is a part of element | |
| charged particle | is accelerated by electric or magnetic fields | |
| has charge non-zero | |
| particle | obeys uncertainty principle | |
| has frequency inversely proportional to the wavelength | |
| has wavelength inversely proportional to its momentum | |
| has mass | |
| physical object | has location or center of gravity | |
| has angular momentum | |
| has velocity | |
| has momentum | |
| has temperature | |
| has volume | |
| has extent | |
| has material | |
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