Based on the group valency of elements state the formula for the following giving justification for each : (i) Oxides of 1^(st) group elements, (ii) Halides of the elements of group 13, and (iii) Compounds formed when an element of group 2 combines with, an element of group 16.

Based on the group valency of elements state the formula for the follo

1.	Based on the group valency of elements state the formula for the following giving justification for each : (i) Oxides of 1^(st) group elements, (ii) Halides of the elements of group 13, and (iii) Compounds formed when an element of group 2 combines with, an element of group 16.
Answer» Solution :(i) Valency of group 1 ELEMENTS = 1 Valency of oxygen = 2 Oxides of group 1 elements : FORMULA of the oxides of group 1 is `M_(2)O`, where M is the group 1 element and O is oxygen. (ii) Valency of group 13 elements = 3 Valency of halogens = 1 Halides of group 13 elements : Formula of the halides of group 13 is `MX_(3)`, where M is the group 13 element and X is HALOGEN. (iii) Valency of group 2 elements = 2 Valency of group 16 elements = 2 Compounds of group 2 and group 16 elements : Formula of the compounds of group 2 and 16 is MN, where M is the group 2 element and N is the group 16 element.