• # question_answer Which of the following is largest [CBSE PMT 1996] A) $C{{l}^{-}}$ B) ${{S}^{2-}}$ C) $N{{a}^{+}}$ D) ${{F}^{-}}$

${{S}^{2-}}$ and $C{{l}^{-}}$both are isoelectronic but nuclear charge of $C{{l}^{-}}$ is more than ${{S}^{2-}}$. So it has largest size.