Question

The electronic configuration of the elements A and Bare Is2, 2s2,2p6,3s2 and Is2,2s2*,2p5 respectively. The formula of the ionic compound that can be formed between these elements is (a) AB (b) AB2 (c) A2B (d) none of the above​

Answer 1

Answer:

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Explanation:

The first element A, has 2 electrons in it's outermost shell, thus it valency is 2.

The second element B, has 7 electrons in it's outermost shell, thus it's valency is 1.

Thus theformula of the ionic compound formed by these atoms is AB2.

Hope this helps, inform if wrong.

Btw, the elements are Mg and F respectively.