atomic (redirected from Atomic mass number)

atomic (tom´ik),

adj pertaining to the atom.

atomic energy,

n See energy, atomic.

atomic mass number,

n (symbol: A), the total number of nucleons (protons and neutrons) of which an atom is composed.

atomic number (Z),

n 1. the number of electrons outside the nucleus of a neutral atom.
n 2. the number of protons in the nucleus.

atomic structure theory,

n the theory that matter is composed of a vast number of particles, or atoms, bound together by a force of attraction of electrical charges.

atomic weight,

n the weight of one atom of an element as compared with the weight of an atom of hydrogen.