Exceptions to the Octet Rule

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Exceptions to the Octet Rule
• Atoms with fewer than 4 electrons sharing them to form
covalent bonds like Be and B in BeCl2 and BCl3
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: Cl . .Be. .Cl:
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o Certains atoms in the higher periods like Phosphorus in PCl5
and S in SF6 have 5 and 6 bonding pairs
Cl
Cl
F
P
Cl
F
S
Cl
F
Cl
F
F
F
o An odd number in the total valence electrons like NO2 with a
total valence electrons of 5 + ( 6 x2) = 17
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O = N –O: N did not follow the octet.
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