Why is the ionisation potential of sulphur lower than phosphorus?

1.	Why is the ionisation potential of sulphur lower than phosphorus?
Answer» There are three competing factors for which the ionisation potential of sulphur lower than phosphorus: 1. The effective nuclear charge 2. The size of the atom and the force of attraction according to Coulomb's law 3. A pair of electrons in an orbital In case of phosphorous and sulfur, phosphorous has the greater ionization energy which means that it takes more energy to remove an electron from a phosphorous atom, which means that the electrons are lower in energy, even though the atom is larger and sulfur has a greater effective nuclear charge. This is what we call as stable half filled configuration of phosphorus.

Answer»

There are three competing factors for which the ionisation potential of sulphur lower than phosphorus:
1. The effective nuclear charge
2. The size of the atom and the force of attraction according to Coulomb's law
3. A pair of electrons in an orbital

In case of phosphorous and sulfur, phosphorous has the greater ionization energy which means that it takes more energy to remove an electron from a phosphorous atom, which means that the electrons are lower in energy, even though the atom is larger and sulfur has a greater effective nuclear charge.

This is what we call as stable half filled configuration of phosphorus.

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