Question

effect on reactivity when we go (i)up to down a group. (ii) left to right in periods

Answer 1

(i) increases

(ii) decreases

Answer 2

As we move down a group mettalic character of elements increases as tendency to donate electron s increases,this increase the chemical reactivity.

As we move across a

Period tendency to lose decreases and gain electrons increases ie mettalic charachter decreases ,this decreases the reactivity of elements across a group