JEE Main Chemistry question
The electronic configurations of four elements and are given in brackets: , , , . The formulas of ionic compounds that can be formed between these elements are
Answer: (C)
Solution
L (, 6 valence electrons, like O) has valency . P (, 1 valence electron outside a closed shell, like Na) has valency . Q (, 7 valence electrons, like F) has valency . R (, 2 valence electrons, like Mg) has valency .
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