\( \mathrm{Be}^{2+} \) is isoelectronic with which of the following...

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\( \mathrm{Be}^{2+} \) is isoelectronic with which of the following ions?
P
(a) \( \mathrm{H}^{+} \)
(b) \( \mathrm{Li}^{+} \)
W
(c) \( \mathrm{Na}^{+} \)
(d) \( \mathrm{Mg}^{2+} \)
(2014)
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