Question

pf5 does not obey octet rule why

Answer 1

Pf5 does not obey octet rule as P has 5 valence electrons. Now when it forms bond with 5 fluorine atoms P has 10 electrons which is not according to the octet rule but it is an expanded octet
And hence Pf5 does not obey octet rule.

Answer 2

pf5 does not obey the octet rule because the central atom has more than 8 electrons.

• Any atom tries to be stable.

• Octet rule states that an atom will be stable if it has 8 electrons in its valence shell.
• If the central atom has more than 8 electrons then that rule is called an expanded octet.
• Some examples of the expanded octet are HF6 and H2SO4.
• As PF5 has 8 electrons in its valence shell so it doesn't follow the octet rule.

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