Inert elements share the characteristic of having filled outermost shells, rendering them chemically unreactive.
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The valency of elements with completely filled outermost shells is zero.
A helium atom has two electrons in its outermost shell.
Atoms with completely filled outermost shells exhibit little chemical activity and have a valency of zero, making them inert.
The outermost shell of an atom can accommodate a maximum of 8 electrons.