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Question

Chemistry Question on Chemical bonding and molecular structure

Which of the following molecules exist?

A

He2He_2

B

Be2Be_2

C

Ne2Ne_2

D

C2C_2

Answer

C2C_2

Explanation

Solution

He2:σ1s2,σ∗1s2He_{2} : \sigma1s^{2}, \sigma^* 1s^{2}
B.O. = 12(2−2)=0,He2 \frac{1}{2} (2 -2) = 0 , He_2 does not exist.
Be2:σ1s2,σ∗1s2,σ∗2s2Be_2 :\sigma 1s^{2}, \sigma^* 1s^{2} ,\sigma^* 2s^{2}
B.O. =12(4−4)=0,Be2 = \frac{1}{2}(4 - 4) = 0, Be_2 does not exist.
Ne2=σ1s2,σ∗1s2,σ2s2,σ∗2s2,σ2pz2,(π2px2=π2py2)(π∗2px2=π∗2py2),σ∗2pz2Ne_{2} =\sigma 1s^{2}, \sigma^* 1s^{2},\sigma 2s^{2},\sigma^* 2s^{2}, \sigma 2p^{2}_{z} ,\left(\pi2p_{x}^{2} =\pi2p_{y}^{2}\right)\left(\pi^* 2p_{x}^{2} =\pi^* 2p_{y}^{2}\right), \sigma^* 2p_z^2
B.O. =12(10−10)=0,Ne2= \frac{1}{2} \left(10 -10\right)= 0, Ne_2does not exist.
C2:σ1s2,σ∗1s2,σ2s2,σ∗2s2,(π2px2=π2py2)C_2 : \sigma1s^2 , \sigma^* 1s^2 , \sigma2s^2 ,\sigma^* 2s^2 , (\pi 2p_x^2 = \pi 2p_y^2)
B.O =12(8−4)=2,C2 =\frac{1}{2}\left(8 - 4 \right)= 2 , C_2 exists.