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.