Question

Using the periodic table,predict the formula of compound formed between the element X of group 13 and another element Y of group 16

Answer 1

X’ is in group 13 
=> x has a valency 3
‘Y’ is in group 16
=> y has a valency of 2
X. Y. 
3. 2

Answer 2

element X configuration is 2 8 3

Y ......is 2 8 6

hence compound formed is X2Y3