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Which one of the following grouping represents a collection of isoelectronic species? (At. no., \( \mathrm{Cs}=55 \)
\( \mathrm{P} \) and \( \mathrm{Br}=35) \)

W
(a) \( \mathrm{N}^{3-}, \mathrm{F}^{-}, \mathrm{Na}^{+} \)
(b) \( \mathrm{Ca}^{2+}, \mathrm{Cs}^{+}, \mathrm{Br} \)
(c) \( \mathrm{Be}, \mathrm{Al}^{3+}, \mathrm{Cl}^{-} \)
(d) \( \mathrm{Na}^{+}, \mathrm{Ca}^{2+}, \mathrm{Mg}^{2+} \)
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