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How can you use molecular orbital diagrams to predict bond order?

Question

How can you use molecular orbital diagrams to predict bond order? 

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Step 1

The bond order of a molecule is determined by number of bonding and anti-bonding electrons in it.

Number of bonding electrons -number of antibonding electrons
Bond order
2
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Number of bonding electrons -number of antibonding electrons Bond order 2

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Step 2

The molecular orbital diagram of Dihelium (He2) is used to explain bond order calculation.  There are two ...

Non-bonding
electrons
E
Не
Не
Bonding electrons
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Non-bonding electrons E Не Не Bonding electrons

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