Question

What atomic terms (including J values) are possible for the configuration np¹nf¹? what is the ground state term?

Answer 1

ANSWER:-

term symbol formula is ^2S+1L_J

atomic term symbol for np1

• L value for p +1 because there is only one electron so L = p because 0,1,2,3 stands for s,p,d,f...
• 2S+1 value is ,

s= number of unpaired electrons present so there is only one electron

s = 1/2 x no of unpaired electrons

s = 1/2x 1 = 1/2

• so 2S+1 = 2
• ang J=[L-S] for less then half-filled subshell
• so J = 1
• so term symbol for np1 is ²P₁

and for nf1 L value for f orbital should be 3

and 2S+1 = 2

and J=[L-S]

J = 1

so term symbol for nf1 is ²F₁