1. If M, an element from group IIA of the periodic table, combines with an element X from group VIIA what will be the chemical formula of the compound formed?
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Solution
M is an element from group IIA, so it is metal and X is from VIIA, so it is non-metal.
Thus, the nature of the compound is ionic.
Hence, the formula of the compound formed is MX2 since the electrovalency of M is 2 and X is 1.
Example - CaCl2, here Calcium (Ca) belongs to the IIA group and Chlorine (Cl) belongs to the VIIA group.