Alternative spelling of subatomic

Alternative letter-case form of Atomic Age

The exposure of plants to radioactive sources, typically cobalt-60, in order to generate mutations that may prove to have useful properties.

(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.

(physics) A nucleus of an atom; consisting of protons and neutrons, surrounded by an electron cloud.

(uncommon) Nuclear winter.