An octet refers to a fully-filled outermost shell of an atom, which contains eight electrons.
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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.
The valency of elements with completely filled outermost shells is zero.
A helium atom has two electrons in its outermost shell.