Question

The IIA group metal ion having $6s^2,6p^6$ as outer electron configuration is:

• A. $C{a}^{2+}$
• B. $S{a}^{2+}$
• C. $B{a}^{2+}$
• D. $R{a}^{2+}$

Answer 1

The correct option is D $R{a}^{2+}$

The outermost and the penultimate shell of radium has electronic configuration $6s^{2}6p^6,7s^2$.

It loses two electrons present in the 7s subshell to form $R{a}^{2+}$ ion which has outer electronic configuration $6s^{2}6p^6$.

Hence, the correct option is $\text{D}$