A) \[Ar\]
B) \[Cl\]
C) S
D) \[Ca\]
Correct Answer: A
Solution :
Those species (element, atom or ions) which have same number of electrons are called isoelectronic. Example\[-{{K}^{+}}\]and \[Ar\] Number of electrons in \[{{K}^{+}}=19-1=18{{e}^{-}}\] Number of electrons in \[Ar=18\text{ }{{e}^{-}}\]
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