Which sequence correctly arranges Br⁻, Kr

CHEMISTRY · Single correct · A Level · Chemistry · Periodicity and periodic trends · Periodicity and periodic trends

Problem

Which sequence correctly arranges Br⁻, Kr, and Rb⁺ in order of increasing radius? (a) Kr<Br−<Rb+\mathrm{Kr < Br^- < Rb^+} (b) Kr<Rb+<Br−\mathrm{Kr < Rb^+ < Br^-} (c) Rb+<Kr<Br−\mathrm{Rb^+ < Kr < Br^-} (d) Br−<Kr<Rb+\mathrm{Br^- < Kr < Rb^+}

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