The electronic configurations of four elements are: A : \( 1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2},....

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The electronic configurations of four elements are:
A : \( 1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{2}, 3 \mathrm{p}^{4} \)
\( \mathrm{P} \)
B : \( 1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{2} 3 \mathrm{p}^{5} \)
C : \( 1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{1} \)
D : \( 1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{2} \)
The formulae of ionic compounds that could be formed between them are:
(1) \( \mathrm{A}_{2} \mathrm{C}, \mathrm{DA}, \mathrm{CB}, \mathrm{D}_{2} \mathrm{~B} \)
(2) \( \mathrm{C}_{2} \mathrm{~A}, \mathrm{DA}, \mathrm{CB}, \mathrm{DB} \)
(3) \( \mathrm{AC}, \mathrm{D}_{2} \mathrm{~A}, \mathrm{C}_{2} \mathrm{~B}, \mathrm{DB} \)
(4) \( \mathrm{C}_{2} \mathrm{~A}, \mathrm{DA}, \mathrm{CB}, \mathrm{DB}_{2} \)


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