Question

How does the valency of elements change
on moving from left to right in a period of the periodic table.​

Answer 1

On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases. On moving from left to right in a period, the number of valence electrons increases from 1 to 8. On Moving from left to right in a period, the atomic size decreases; the size of the atoms decreases.