Question

Based on the group valency of elements, state the formula for the following giving justification for each.
A) Oxide of 1st group elements.
B) Halides of the elements of group 13
C) Compounds formed when an element of group 2 combines with an element of group 16 .

Answer 1

1)let x is element of 1st group
Formula X2O
2)let y is element of 13 group
Formula HY
3)X is 2nd group element and Y is 16 group element
Formula XY