plural of atomic

The study of physics at an atomic level.

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

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

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

(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.

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

(uncommon) Nuclear winter.

(physics) a hydrogen-like system consisting of an ordinary nucleus with a hadron in orbit.