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

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

(physics) an early nuclear reactor fuelled by uranium and moderated with graphite

(uncommon) Nuclear winter.

The era, starting in the mid-1940s, during which nuclear energy was developed, and in which it was thought that all energy would be provided by such sources.

(physics) any device that converts the energy of particles emitted from atomic nuclei into electrical energy

Alternative spelling of subatomic

Alternative spelling of subatomic

A nuclear weapon.

(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.