Chemistry

Problem

Which pair of elements would be expected to have identical numbers of valence electrons and therefore the same pattern of Lewis symbols for their atoms? a)

\mathrm{Na}

and

\mathrm{Mg}

\mathrm{He}

and

\mathrm{Ne}

\mathrm{P}

and

\mathrm{As}

\mathrm{Cl}

and

\mathrm{Se}

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