Question

The outermost electronic configuration of elements X and Y are given (symbols are not real) X-3s²,Y-3s²3p⁵ which elements have valency 1​

Answer 1

Answer:

Y

Valency:

Valency is defined as the number of hydrogen atoms which combine directly or indirectly with one atom of an element.

Explanation:

Y can combine with one  hydrogen so its valency is 1