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

The Periodic Table: chemical periodicity — practice question

This question is about isolated gaseous species. The species $\text{F}^-$, Ne and $\text{Na}^+$ are isoelectronic. This indicates that they contain the same number of electrons. In what sequence do their radii increase?

  • Asmallest $\text{Na}^+$ $\rightarrow$ $\text{F}^-$ $\rightarrow$ Ne largest
  • Bsmallest $\text{F}^-$ $\rightarrow$ Ne $\rightarrow$ $\text{Na}^+$ largest
  • Csmallest $\text{Na}^+$ $\rightarrow$ Ne $\rightarrow$ $\text{F}^-$ largest
  • Dsmallest Ne $\rightarrow$ $\text{F}^-$ $\rightarrow$ $\text{Na}^+$ largest

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