How you work out the group an element belongs to by looking at the ionisation energies??

The ionisation energies are 560, 1800, 14000, 17000, 21000 and the element is in third period. Can you also explain why?? Any help is appreciated!! or

The ionisation energies are 560, 1800, 14000, 17000, 21000 and the element is in third period. Can you also explain why?? Any help is appreciated!!

or:The ionisation energies are 560, 1800, 14000, 17000, 21000 and the element is in third period. Can you also explain why?? Any help is appreciated!!


or:\"Group\" is determined by proton count and nothing else.

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