Question

Why is the trend of First Ionization enthalpy opposite between V and VI groups in the modern periodic table?

Answer 1

❣❣HEYA ❣❣

Increase in atomic size of the elements. As we move down in a group, number of shells goes on increasing, due to which, atomic size increases. As electrons move away from nucleus they are not held very strongly. Thus, they can be removed easily, so ionization energy decreases on moving down a group.

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