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Ionization Enthalpy

The atomic nu...

Question

The atomic number of elements A, B and C are (Z - 1), Z and (Z + 1) respectively. B is an inert gas (not helium). Which element among A,B and C has the highest ionization energy? Why?

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Solution

B is an inert gas and thus has a stable fully filled valence configuration.
As ionisation energy is the amount of energy required to remove the valence electron.

Thus, it will be highest for B with atomic number Z.

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