plural of atomism

Archaic form of atomic.

plural of atomic number

plural of atomic winter

(physics) The theory that all gross matter is composed of atoms. / (physics) Any of several theories that explain the structure of the atom, and of subatomic particles.

(physics, chemistry) The number of protons in an atom. Symbol: Z

The mass of an atom. / (proscribed) atomic weight; the average mass of atoms of an element.

(physics) Former term for the more specific relative atomic mass.

(countable, military) A nuclear weapon that obtains its destructive energy from nuclear fission.

(quantum mechanics, chemistry) A mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom. This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus.