A) He
B) \[\text{H}{{\text{e}}^{+}}\]
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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