Which of the following have total 18 electrons and it is larger than ${Cl}^{-}$ ?

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${Br}^{-}$

${Ca}^{2 +}$

$K^{+}$

None of these

answer is D.

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Detailed Solution

Argon has 18 electrons; $Ar$ . Due to its stable octet configuration, argon just maintains its electrons where they are and does not try to drag them slightly inwards. A chlorine atom is smaller than an argon atom. The right choice is D.

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