Question

Based on the group valency of elements state the formula for the following giving justification for each:; (i) Oxides of 1st 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.(Delhi - 2014)

Answer 1

Answer:

yes yes yes because oxides in group this are s block element and halides are p group element

Answer 2

I) M - 1st group element

O - oxygen

The valency of first group elements +1 whereas the valency of oxygen is -2 .

Thus the formula of oxides is M2 O.

II) M - 13th group element

X - halogen

The valency of group 13 elements is +3 and the valency of halogen is -1.

Thus the formula of the halides formed is MX3.

III) M - group 2 element

Y - group 16 element

The valency of the group 2 elements is +2 and the valency of group 16 elements is -2 .

Thus the formula of the compounds formed is MY.