Chemistry - Periodic Table+IE(check+help)

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The following data lists the ionization energies for a given atom: IE1 = 738Kj/mol; IE2 = 1451Kj/mol; IE3 = 7733Kj/mol. Predict the valence electron configuration for this atom, and explain your reasoning.

i do not understand this question but i will give it a try, please check if correct and if incorrect help me understand the concept.

Ans: since it has three ionization energies,it can be an element from the group 15, since the first orbit which is closest to the nucleus is filled, the second orbit is filled as well, and the third one will have 5 filled.

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