Question

how scandium's valency is 3

Answer 1

atomic number of scandium is 21
its electronic configuration=2,8,8,3
its easy for scandium to lose 3 electrons than to gain 5 electrons to complete its octet
therefore it loses 3 electrons and thats why its valency is 3

Answer 2

hey
!!!!!!!!!!!!

u r answer.

the outermost cell of scandium is only three electron.

k=2
l=8
m=8
n=3.

in N only three electron then the valency is three .

ok