Total number of ions from the following with noble gas configuration is $\qquad$ -.\ $\mathrm{Sr}^{

Question

Total number of ions from the following with noble gas configuration is $\qquad$ -.\ $\mathrm{Sr}^{2+}(Z=38), \mathrm{Cs}^{+}(Z=55), \mathrm{La}^{2+}(Z=57), \mathrm{Pb}^{2+}(Z=82)$, $\mathrm{Yb}^{2+}(\mathrm{Z}=70)$ and $\mathrm{Fe}^{2+}(\mathrm{Z}=26)$\

Professor PC Thomas Classes · Answer

(2) : Ion Electronic $$ \begin{array}{ll} \mathrm{Sr}^{2+} & {[\mathrm{Kr}]} \ \mathrm{Cs}^{+} & {[\mathrm{Xe}]} \ \mathrm{La}^{2+} & {[\mathrm{Xe}] 5 d^{1}} \ \mathrm{~Pb}^{2+} & {[\mathrm{Xe}] 4 f^{14} 5 d^{10} 6 s^{2}} \ \mathrm{Yb}^{2+} & {[\mathrm{Xe}] 4 f^{14}} \ \mathrm{Fe}^{2+} & {[\mathrm{Ar}] 3 d^{6}} \end{array} $$