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An element X is in group 2 of the periodic table:
(a) What will be the formula of its chloride?
(b) What will be the formula of its oxide?
An element X is in group 2 of the periodic table. Therefore, the valency of X is 2.
(a) Chlorine has 7 valence electrons. Therefore, the valency of chlorine Cl is 1, that is, (8 - 7). Hence, the ionic compound is XCl2.
(b) Oxygen has 6 valence electrons and needs 2 more electrons to complete its octet. Therefore, the valency of oxygen O is 2, that is, (8 - 6). Hence, the ionic compound is XO.
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