Question

1)how many electrons in an atom may have the following quantum numbers?n=4,m=-1/2
2)name the element having highest -ve electron gain enthalpy

Answer 1

1) zero..bcuz m cant be -1/2..as if n=4 then l=0,1,2,3 and then m=-3,-2,-1,0,1,2,3..
2)element having highest electron gain enthaply is chlorine