First slide
Periodicity in atomic properties
Question

Which represents the correct order of first ionisation potential of third period elements?

Moderate
Solution

Generally, ionisation potential increases, as we move from left to right in a period. However the ionisation Potential of II group elements is higher than that of the III A group elements. This is because of the fully-filled s-orbitals in II group elements.
Hence, the correct order of ionisation potential is

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