Term Symbols

Question 1

Spin angular momentum

Answer 1

S = total spin angular momentum, electrons in same orbital paired (Pauli) therefore S = 0, 2S+1 possible projections

Question 2

Closed shell

Answer 2

All electrons paired

Question 3

Term symbol of closed shell molecules

Answer 3

Totally symmetric irreducible representation

Question 4

Orbital angular momentum

Answer 4

Electron in σ orbital has λ =0
Electron in π orbital has λ =+-1
Two electrons in same π orbital have same λ
Sum all individual λ for all electrons to get total projection along inter nuclear axes of total angular momentum, Λ