The number of electrons gained, lost, or shared by an atom to achieve an octet in its outermost shell determines its combining capacity.
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Atoms achieve an octet in their outermost shell by either sharing, gaining, or losing electrons during chemical reactions.
An octet refers to a fully-filled outermost shell of an atom, which contains eight electrons.
The combining capacity of atoms was explained as the tendency to attain a fully-filled outermost shell, known as an octet, through sharing, gaining, or losing electrons.
Inert elements share the characteristic of having filled outermost shells, rendering them chemically unreactive.