Question

exceptions of octet rule?

Answer 1

1.incomplete octet configuration.

2.expanded octet.

3.can't say about geometry of molecule.


1&2:the compounds not following octet rule are existing.

Answer 2

Exceptions of octet rule:

Exception 1:  Odd Numbers of Electrons:

• In octet rule, the first exception if there is an odd number of valence electrons.

• Not all the molecules will contain an even number valence-shell electrons in which that it forms a molecule.

• This ends with the atom is not satisfying the octet rule by odd number of valence shell electron.

• For example of Nitrogen (II) oxide.

Exception 2: Incomplete Octet:

• The second exception of octet rule is some valence electron result in the incomplete octet.

• Lewis structure does not produce the valence shell octet to every atom.

• For example Be, B and Al produce an incomplete octets in the central most atom.

Exception 3: Octet is expanded:

• The element belongings to group 15,16 and 17  have more than 4 electron. the elements of these groups form a stable compound in which there are more than 8 electrons.

• Some examples are $PF_5$  and $SF_6$.

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