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Chemistry Question on GROUP 2 ELEMENTS

The molecular electronic configuration of Be2Be_2 is:

A

σ1s2σ∗1s2σ2s2σ∗2p2 \sigma 1 s^2 \sigma^* 1s^2 \sigma2s^2 \sigma^* 2p^2

B

KKσ2s2KK \sigma2s^2

C

σ1s2σ∗1s2σ2s2σ∗2s2 \sigma1s^2 \sigma^* 1s^2 \sigma 2s^2 \sigma^* 2s^2

D

none of the above

Answer

σ1s2σ∗1s2σ2s2σ∗2s2 \sigma1s^2 \sigma^* 1s^2 \sigma 2s^2 \sigma^* 2s^2

Explanation

Solution

Total no. of electrons in Be2=8Be _{2}=8.
Electronic configuration according to molecular orbital theory:
σ1s2,σ∗1s2,σ2s2=σ∗2s2\sigma 1 s^{2}, \sigma^{*} 1 s^{2}, \sigma 2 s^{2}=\sigma^{*} 2 s^{2}