Question
Search more atoms, which complete their octet during chemical combinations.

Answer

In compounds like $KCl, MgCl_2, CaO, NaF, etc$, the constituent atoms complete their octet by lose or gain of electrons.
$e.g. K \rightarrow K^+ + e^–$
$Cl + e^– \rightarrow Cl^–$
$K^+ + Cl^– \rightarrow KCl$
[Note: Students are expected to search more atoms on their own.]

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