The concept that nearly all nonmetal elements desire eight valence electrons and will bond in order to achieve this (thereby becoming stable) is known as

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.

Ithink is d. physical property