Structure Of Atom Question 7
Question 7 - 2024 (27 Jan Shift 2)
Total number of ions from the following with noble gas configuration is _________.
$\mathrm{Sr}^{2+}(\mathrm{Z}=38), \mathrm{Cs}^{+}(\mathrm{Z}=55), \mathrm{La}^{2+}(\mathrm{Z}=57) \mathrm{Pb}^{2+}$
$(\mathrm{Z}=82), \mathrm{Yb}^{2+}(\mathrm{Z}=70)$ and $\mathrm{Fe}^{2+}(\mathrm{Z}=26)$
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Answer (3)
Solution
Noble gas configuration $=n s^{2} n p^{6}$
$$ \begin{aligned} & {\left[\mathrm{Sr}^{2+}\right]=[\mathrm{Kr}]} \ & {\left[\mathrm{Cs}^{+}\right]=[\mathrm{Xe}]} \ & {\left[\mathrm{Yb}^{2+}\right]=[\mathrm{Kr}] 4 \mathrm{~d}^{10} 4 \mathrm{f}^{14} 5 \mathrm{~s}^{2} 5 \mathrm{p}^{6}} \ & {\left[\mathrm{La}^{2+}\right]=[\mathrm{Xe}] 5 \mathrm{~d}^{1}} \ & {\left[\mathrm{~Pb}^{2+}\right]=[\mathrm{Xe}] 4 \mathrm{f}^{14} 5 \mathrm{~d}^{10} 6 \mathrm{~s}^{2}} \ & {\left[\mathrm{Fe}^{2+}\right]=[\mathrm{Ar}] 3 \mathrm{~d}^{6}} \end{aligned} $$
