Chemical Bonding and Molecular Structure
Molecular Orbital Theory
MOED (molecular orbital energy diagram) : (from O2 molecule onwards)
\sigma 1s < \sigma^{*}1s <\sigma2s < \sigma^{*}2s < \sigma2p_{z} < \pi2p_{x} = \pi2p_{y} < \pi^*2p_{x} < \sigma^* 2p_{z}
MOED (From N2 molecule onwards)
\sigma 1s < \sigma^{*}1s <\sigma2s < \sigma^{*}2s < \pi2p_{x} = \pi2p_{y} < \pi2p_{z} < \pi^*2p_{x} = \pi^*2p_{y} < \sigma2p_{z}
H2 molecule (2e-)
Bond \ order = \frac{2 - 0}{2}
= 1 (Dia magnetic)
Be2 (8e-)
MOED = σ1s2 σ*1s2 σ2s2 σ*2s2
BO = 0 ⇒ \frac{4 - 4}{2} (can't exist)
dia magnetic
Short cut to determine magnetic nature :
no.of electrons | Bond order | magnetic character |
10 | 1 | P |
11 | 1.5 | P |
12 | 2 | D |
13 | 2.5 | P |
14 | 3 | D |
15 | 2.5 | P |
16 | 2 | P |
17 | 1.5 | P |
18 | 1 | D |
P - Paramagnetic
D - Diamagnetic
Part1: View the Topic in this Video from 0:01 to 9:50
Part2: View the Topic in this Video from 0:59 to 45:55
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