Which pair of elements would be expected to have identical numbers of valence…

CHEMISTRY · Single correct · A Level · Chemistry · Atomic structure · Atomic structure

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}

(b)

\mathrm{He}

and

\mathrm{Ne}

(c)

\mathrm{P}

and

\mathrm{As}

(d)

\mathrm{Cl}

and

\mathrm{Se}

Related theory

Electronic Configuration
Atomic Structure
Electron Configurations
Blocks, groups and periods
Classification of Elements and Periodicity in Properties
Electronic Configurations and Types of Elements

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