Chemistry 9701 · AS & A Level · The Periodic Table: chemical periodicity

The Periodic Table: chemical periodicity — practice question

This question concerns isolated gaseous species. The species $\text{F}^-$, $\text{Ne}$ and $\text{Na}^+$ are isoelectronic, which means that each has the same number of electrons. In what order do their radii increase?

  • A$\text{Na}^+ \rightarrow \text{F}^- \rightarrow \text{Ne}$
  • B$\text{F}^- \rightarrow \text{Ne} \rightarrow \text{Na}^+$
  • C$\text{Na}^+ \rightarrow \text{Ne} \rightarrow \text{F}^-$
  • D$\text{Ne} \rightarrow \text{F}^- \rightarrow \text{Na}^+$

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