| atom | a former agency (from 1946 to 1974) that was responsible for research into atomic energy and its peacetime uses in the United States |
|---|---|
| atom | the explosion of an atomic bomb |
| atom | (chemistry) the mass (in atomic mass units) of an isotope of an element |
| atom | unit of mass for expressing masses of atoms or molecules |
| atom | the order of an element in Mendeleyev's table of the elements |
| atom | a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas |
| atom | a colorless odorless gaseous element that give a red glow in a vacuum tube |
| atom | a radioactive transuranic metallic element produced by bombarding plutonium with neutrons |
| atom | a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium |
| atom | a radioactive transuranic element synthesized by bombarding curium with carbon ions |
| atom | a radioactive transuranic element synthesized from californium |
| atom | a radioactive transuranic element which has been synthesized |