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| atomic bomb |
a very destructive bomb; atom bomb. Its power comes from the great amount of energy released when atoms are split. |
| dioxide |
a compound containing two atoms of oxygen bound to a single atom of another element. |
| electron |
a very small particle that moves outside the nucleus of an atom. Electrons have a negative charge. |
| fission |
the splitting of the nucleus of an atom into two or more nuclei. This makes more atoms of lighter elements and gives off large amounts of energy. |
| ion |
an atom or group of atoms that has an electrical charge. |
| molecule |
the smallest unit of a substance that has all the properties of that substance. A molecule is made up of a single atom or group of atoms. |
| neutron |
a small particle present in the nucleus of all atoms except the hydrogen atom. Neutrons have no electrical charge. The mass of a neutron is about equal to the mass of a proton. |
| nuclear |
of, or having to do with, or being the nucleus of an atom or a cell. [1/3 definitions] |
| nucleus |
the central part of an atom, which has a positive charge. [1/3 definitions] |
| proton |
a tiny particle in the nucleus of an atom. A proton has a positive electrical charge. |
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