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74. for molecules, the state2 refers to (a) spin of the electrons being zero (b) orbital angular momentum of electrons being zero (c) both the spin and orbital
74. For molecules, the state2 refers to (A) Spin of the electrons being zero (B) Orbital angular momentum of electrons being zero (C) Both the spin and orbital angular momentum of the electrons being zero (D) The angular momentum of nuclear rotation being zero
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The quantum numbers for diatomic molecules are similar from the atomic quantum numbers. The rules for finding the possible combinations are different in case of molecules. The total orbital angular momentum quantum number For the molecular case, this number is called Λ instead of L. It follows the same naming convention as L, except that instead of using capital English letters, it uses capital Greek letters: Λ=0→Σ Λ=1→Π Λ=2→Δ Λ=3→Φ Now, the total z-projection of L can be defined as: ML As states with positive and negative values of ML are degenerate, we define Λ = |ML|, The molecular term symbol is then defined as 2S+1Λ and the number of electron degenerate states (under the absence of spin-orbit coupling) corresponding to this term symbol is given by: (2S+1)×2 if Λ is not 0 (2S+1) if Λ is 0. So for 1Σ means Λ is 0 ans S=0 . So option (C) is correct.