In which of the following species,the ratio o | vedclass

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(A) The ratio of $s$-electrons to $p$-electrons is determined by the electronic configuration of each species.For $K^{+}$ $(Z=19)$: $1s^2 2s^2 2p^6 3s

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$K^{+}, Cr^{3+}$

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(A) The ratio of $s$-electrons to $p$-electrons is determined by the electronic configuration of each species.For $K^{+}$ $(Z=19)$: $1s^2 2s^2 2p^6 3s^2 3p^6$. Total $s$-electrons = $2+2+2 = 6$. Total $p$-electrons = $6+6 = 12$. Ratio = $6:12 = 1:2$.For $Cr^{3+}$ $(Z=24)$: $1s^2 2s^2 2p^6 3s^2 3p^6 3d^3$. Total $s$-electrons = $2+2+2 = 6$. Total $p$-electrons = $6+6 = 12$. Ratio = $6:12 = 1:2$.Since both $K^{+}$ and $Cr^{3+}$ have the same ratio of $1:2$,the correct option is $A$.

In which of the following species,the ratio of $s$-electrons to $p$-electrons is the same?

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