Question

Please answer this question

Answer 1

Answer:

a)ii,ivSince the elements in a group have same number of valence electrons , they can either contains metals or non-metals like alkali and alkaline metals have only metals where as halogens are non-metals.

b)PH3

c)K is more positive than Na

Answer 2

Answer:

a) ii

b) ii PH3

c) K is more electropositive. Down the group electropositive character increases.