Question

Based on the group valency of elements state the formula for the following giving justification for each

1. Oxides of 1st group elements

2.Halides of the elements of group 13 and

3.Compunds formed when an element of group 2 combines with an element of group 16

Answer 1

1. Formula for Oxides of 1st group element- E2O
Where E stands for the element
Valancy of E Valancy of O
1 2
Exchange Valancy
- E2O
3. Formula of Compounds formed when an element of group 2 combines with an element of group 16-
Xz
Where x stand for elements of group2&
Z stand for elements of group 16