Which of the following have an (18+2) electron configuration?

P b^{2 +}

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C d^{2 +}

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B i^{3 +}

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S O_{4}^{2 -}

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Solution

The correct options are
A $P b^{2 +}$
D $B i^{3 +}$
(18+2) electron configuration
Electronic configuration
$P b^{+ 2} 5 d^{10} 6 s^{2}$ so 18+2 configuration
$B i^{+ 3} 5 d^{10} 6 s^{2}$ so 18+2 configuration

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