The compound that does not follow the octet rule for electron distribution is PCl5.

The octet rule states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas.

In PCl5 (Phosphorus pentachloride), the central phosphorus atom is surrounded by 10 electrons, not 8. It has 5 valence electrons and it forms 5 bonds with chlorine atoms, so it actually expands its valence shell to hold more than 8 electrons. This is possible because phosphorus is in the third period of the periodic table that have d orbitals available for bonding.

So, the correct answer is A. PCl5.

Question

The compound that does not follow the octet rule for electron distribution is PCl5.

The octet rule states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas.

In PCl5 (Phosphorus pentachloride), the central phosphorus atom is surrounded by 10 electrons, not 8. It has 5 valence electrons and it forms 5 bonds with chlorine atoms, so it actually expands its valence shell to hold more than 8 electrons. This is possible because phosphorus is in the third period of the periodic table that have d orbitals available for bonding.

So, the correct answer is A. PCl5.

Knowee AI · Accepted Answer

The compound that does not follow the octet rule for electron distribution is PCl5.

The octet rule states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas.

In PCl5 (Phosphorus pentachloride), the central phosphorus atom is surrounded by 10 electrons, not 8. It has 5 valence electrons and it forms 5 bonds with chlorine atoms, so it actually expands its valence shell to hold more than 8 electrons. This is possible because phosphorus is in the third period of the periodic table that have d orbitals available for bonding.

So, the correct answer is A. PCl5.

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