The electronic configuration of four elements L, P \( \mathrm{P}, \...
0The electronic configuration of four elements L,
P \( \mathrm{P}, \mathrm{Q} \) and \( \mathrm{R} \), are given in brackets
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\( L\left(1 s^{2}, 2 s^{2} 2 p^{4}\right), Q\left(1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{5}\right) \) \( \mathrm{P}\left(1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{1}\right), R\left(1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{2}\right) \)
The formula of ionic compounds that can be formed between these elements are
(1) \( \mathrm{L}_{2} \mathrm{P}, \mathrm{RL}, \mathrm{PQ} \) and \( \mathrm{R}_{2} \mathrm{Q} \)
(2) LP, RL, PQ and RQ
(3) \( \mathrm{P}_{2} \mathrm{~L}, \mathrm{RL}, \mathrm{PQ} \) and \( \mathrm{RQ}_{2} \)
(4) LP, \( \mathrm{R}_{2} \mathrm{~L}, \mathrm{P}_{2} \mathrm{Q} \) and RQ
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