Elektronová konfigurace hořčíku, stroncia a barya
Napiš elektronovou konfiguraci hořčíku, stroncia a barya podle nejbližšího vzácného plynu.
\( \begin{array}{l}{ }_{12} \mathrm{Mg}:[\mathrm{Ne}] 3 s^{1} \\ { }_{38} \mathrm{Sr}:[\mathrm{Kr}] 5 s^{2} \\ { }_{56} \mathrm{Ba}:[\mathrm{Xe}] 6 \mathrm{~s}^{2}\end{array} \)
\( \begin{array}{l}{ }_{12} \mathrm{Mg}:[\mathrm{Ne}] 3 s^{2} \\ { }_{38} \mathrm{Sr}:[\mathrm{Ar}] 5 s^{2} \\ { }_{56} \mathrm{Ba}:[\mathrm{Xe}] 6 \mathrm{~s}^{2}\end{array} \)
\( \begin{array}{l}{ }_{12} \mathrm{Mg}:[\mathrm{Ne}] 3 s^{2} \\ { }_{38} \mathrm{Sr}:[\mathrm{Kr}] 5 s^{1} \\ { }_{56} \mathrm{Ba}:[\mathrm{Xe}] 6 \mathrm{~s}^{2}\end{array} \)
\( \begin{array}{l}{ }_{12} \mathrm{Mg}:[\mathrm{Ne}] 3 s^{2} \\ { }_{38} \mathrm{Sr}:[\mathrm{Kr}] 5 s^{2} \\ { }_{56} \mathrm{Ba}:[\mathrm{Xe}] 6 \mathrm{~s}^{2}\end{array} \)