A) He
B) \[H{{e}^{+}}\]
C) Li
D) \[{{H}^{+}}\]
Correct Answer: A
Solution :
Isoelectronic species have same number of electrons. In hydride ion \[({{H}^{-}})\], no. of electrons = 1 + 1 = 2 In He, no. of electrons = 2 \[\therefore \,{{H}^{-}}\] is isoelectronic with He.
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