Question

an element of group 15 has atomic number 15 write the number of shell in its configuration write its configuration and find its valency examine if this element will have metallic properties or not

Answer 1

k shell=2
l shell =8
m shell=5
means valence electron =5
valency =8-5
=3

element of group 15 has atomic number 15 :::::
I am not sure

Answer 2

grp 15 means pnictogens, therefore element with atomic no 15 would be phosphorous present in the 3rd period which has electronic configuration of  1s2 2s2 2p6 3s2 3p3  or simply 2,8,5. with 5 valence electron in its outermost shell its valency is 3 in normal condition . therefore in non metal as it takes 3 electrons