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Question

https://www.google.com/search?q=The+following+is+part+of+a+molecular+orbital+energy-level+diagram+for+MOs+constructed+from++1s+atomic+orbitals.&biw=1255&bih=630&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjEwbyGxrvQAhVo2IMKHZ0xBeMQ_AUIBigB#imgrc=c4c016Ta1UY3zM%3A

The following is part of a molecular orbital energy-level diagram for MOs constructed from 1s atomic orbitals.

For which of the following molecules or ions could this be the energy-level diagram:

Check all that apply.

E. H2

What is the bond order of the molecule or ion?

G. 3 I tried posting the picture but it didn't work so hopefully the link I sent shows the correct image. :)

A. H2 B. He2 C. H2+ D. He2+

E. H2

What is the bond order of the molecule or ion?

A. 0 B. 1/2 C. 1 D. 3/2 E. 2 F. 5/2

G. 3 I tried posting the picture but it didn't work so hopefully the link I sent shows the correct image. :)

Explanation / Answer

Since there is ony 1 electron , it must be H2+
Answer: C

Bond order = [(Number of electrons in bonding molecules) - (Number of electrons in antibonding molecules)]/2

Bond order = (1-0)/2
= 1/2
Answer: B

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