Question

Which of the following ion do not have a noble gas electronic configuration? (Atomic numbers: $O=8,Na=11,Ca=20,Mn=25,l=53$)

• A. $O^{2-}$
• B. $N{a}^{+}$
• C. $C{a}^{2+}$
• D. $M{n}^{2+}$
• E. $I^{-}$

Answer 1

Answer: (D)

$M{n}^{2+}$

$M{n}^{2+}=\left[Ar\right]4s^{0}3d^5$ does not have noble gas configuration