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The pair, in which ions are isoelectronic with \mathrm{Al^{3+}} is :

Option: 1

\mathrm{Br}^{-}\text{and} \: \mathrm{Be}^{2+}


Option: 2

\mathrm{Cl}^{-}\text{and} \:\mathrm{Li}^{+}


Option: 3

\mathrm{S}^{2-}\text{and} \:\mathrm{K}^{+}


Option: 4

\mathrm{O}^{2-}\text{and} \:\mathrm{Mg}^{2+}


Answers (1)

best_answer

As we have learnt, 

Isoelectronic species have same number of electrons.

The set of ions having same electrons as \mathrm{Al}^{3+} (10 electrons) are \mathrm{\mathrm{O}^{2-} \text{and }M g^{2+}}

Hence, the answer is Option (4)

Posted by

Kuldeep Maurya

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