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a. Write the term symbols that can occur for the excited Be_{2} electron configuration
(σ_{g}1s)^{2}(σ^{∗}_{u}1s)^{2}(σ_{g}2s)^{2}(σ^{∗}_{u}2s)(σ_{u}2p1)b. Which term will have the lowest energy?
c. What is the bond order for this electron configuration?
d. Do you think the Be_{2} molecule could exist in the excited state corresponding to this electron configuration?
a. M_{L}=1 and there are two u orbitals, so that the term symbols are ^{3}Π_{g} and ^{1}Π_{g}.
b. The lowest energy term symbol will have the maximum value of S, according to Hund’s rule: ^{3}Π_{g}
c. Bond order =(1/2)(5 − 3) =1
d. Since the bond order is nonzero, the molecule should exist in this configuration.