Question

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

• A. $P{b}^{2+}$
• B. $C{d}^{2+}$
• C. $B{i}^{3+}$
• D. $S{O}_4^{2-}$

Answer 1

Answer: (A), (C)

$P{b}^{2+}$
$B{i}^{3+}$

(18+2) electron configuration
Electronic configuration
$P{b}^{+2}5d^{10}6s^2$ so 18+2 configuration
$B{i}^{+3}5d^{10}6s^2$ so 18+2 configuration