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A,B,C and D are four elements of the sam...

A,B,C and D are four elements of the same period, of which A and B belong to s-block. B and D react together to form `B^(+) D^(-)`. C and D unit together to produce a covalent compound, `CD_(2)`.
(1) What is the formula of the compound formed by A and D?
(2) What is the nature of that compound?

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Since A and B are s-block elements of the same period. One of them is an alkali metal of grouppIA while the other is an alkaline earth metal of group- BA. B and D react to form an ionic compound `B^(+)D^(-)`. Therefore, B is a monovalent alkali metal of group-IA and D is a monovalent electronegative element of group-VIIA. hence, the other element A of s-block is definitely a bivalent alkaline earth metal of group-IIA. C and D combine together to produce the covalent compound `CD_(2)`-Hence. C is a bivalent electronegative element belonging to group-VIA.
(1) The formula of the compound formed by the combination of elecropositive bivalent element A with electronegative monovalent element D is `AD_(2)`.
(2) The compound is ionic or electrovalent in nature.
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