exceptions

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Jimmy lira-1G
Posts: 61
Joined: Fri Apr 06, 2018 11:03 am

exceptions

Postby Jimmy lira-1G » Wed May 16, 2018 4:01 pm

Are there any exceptions to the bond length and energy rules that we went over in class today ?


-Jimmy Lira 1g

Alicia Yu 1A
Posts: 30
Joined: Thu Feb 22, 2018 3:02 am

Re: exceptions

Postby Alicia Yu 1A » Thu May 17, 2018 6:42 am

Bonds between like atoms usually become weaker as we go down a column because as two bonded atoms become larger, the distance between them that is occupied by bonding electrons becomes proportionally smaller. Exceptions are single bonds between the period 2 atoms of groups 15, 16, and 17 (i.e., N, O, F), which are unusually weak compared with single bonds in larger halogen atoms. It is likely that the N–N, O–O, and F–F single bonds are weaker than might be expected due to strong repulsive interactions between lone pairs of electrons on adjacent atoms. The trend in bond energies for the halogens is
Cl–Cl>Br–Br>F–F>I–I


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