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12 March, 22:22

Which molecule would you predict would be more stable: be2 - 2 or be2?

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  1. 12 March, 22:37
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    C2^2 + will or will not exist?

    Because of sp mixing Ď3> Ď€1; assume Ď*2 antibonding that is not always the case (can be approximately nonbonding):

    C2^2 + = 6e - Ď1 (2e-) Ď*2 (2e-) Ď€1 (2e-) Ď3 (0e-) Ď€2 * (0e-) Ď4 (0e-) *

    Bond Order (bo) = [ÎŁ (bonding e-) - ÎŁ (antibonding e-) ]/2

    = [4 (Ď1 (2e-) Ď€1 (2e-)) - 2 (Ď*2 (2e-)) ] = 1

    So it is bonding and predicted to exist.

    b. Li2 will or will not exist?

    (cf H2!) Li2 = 2e Ď1 (2e-) Ď*2 (0e-) bo = 1; should (and does) exist

    c. Be2^2 + will or will not exist?

    Be2^2 + = 2e Ď1 (2e-) Ď*2 (0e-) bo = 1; should exist

    d. Li2^2 - will or will not exist?

    Li2^2 - 4e - Ď1 (2e-) Ď*2 (2e-) bo = 0; will not exist
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