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| interatomic |
combined form of atomic. |
| isobar |
any among two or more atoms that have the same atomic weight but different atomic numbers. (Cf. isotope.) [1/2 definitions] |
| isomer |
in physics, one of two or more atomic species that have the same atomic weight and atomic number but different energy levels and half-lives. [1/2 definitions] |
| isotope |
any of two or more atoms that have the same number of protons but differ in the number of neutrons, or that have the same atomic number but different atomic weights. (Cf. isobar.) |
| magneton |
a unit used to express the magnetic moment of an atomic or subatomic particle. |
| molecular weight |
the sum of all the atomic weights of the atoms in a molecule. |
| nonatomic |
combined form of atomic. |
| nuclear |
in physics and biology, of, relating to, or being an atomic nucleus. [3 definitions] |
| nuclear energy |
energy released from atomic nuclei, as in nuclear fission or fusion. |
| nuclear fission |
the splitting of an atomic nucleus into lighter fragments, usu. two of comparable mass, with an accompanying release of energy, as in the explosion of an atomic bomb. |
| nuclear fusion |
the fusion of atomic nuclei into a more massive nucleus, accompanied by a release of energy, as in the explosion of a hydrogen bomb. |
| nuclear physics |
the branch of physics that deals with the forces, behaviors, and structures of atomic nuclei. |
| nucleon |
a proton or neutron, esp. as a component of an atomic nucleus. |
| nucleonics |
(used with a sing. verb) the science or technology having to do with atomic nuclei, esp. with nuclear energy. |
| nucleophile |
a substance that donates electrons or has an affinity for atomic nuclei. |
| particle beam |
a stream of atomic or subatomic particles projected at extremely high speed and used in research, as into nuclear reactions, or in military weaponry. |
| periodic law |
the principle that the properties of the chemical elements recur periodically when the elements are arranged in increasing order of their atomic numbers. |
| periodic table |
a table that illustrates the periodic system of the chemical elements, classified according to atomic number. |
| positronium |
a short-lived atomic system that a positron and electron form before they destroy each other. |
| postatomic |
combined form of atomic. |
| reaction |
in physics, the atomic change that occurs when a nucleus is bombarded with a particle, photon, or other nucleus. [1/6 definitions] |
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