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A-IV, B-III, C-II, D-I
Alkali metals (group 1) $=\mathrm{ns}^1$
Alkaline earth metals (group 2) $=\mathrm{ns}^2$
Halogens $\left(\right.$ group 17) $=n s^2 n p^5$
Noble gases (group 18) $=\mathrm{ns}^2 \mathrm{np}^6$
Alkaline earth metals (group 2) $=\mathrm{ns}^2$
Halogens $\left(\right.$ group 17) $=n s^2 n p^5$
Noble gases (group 18) $=\mathrm{ns}^2 \mathrm{np}^6$
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