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Question

The successive ionization energies for element X is given below
IE1 : 250kJmol−1
IE2 : 820kJmol−1
IE3 : 1100kJmol−1
IE4 : 1400kJmol−1
Find out the number of valence electrons for the element X.

A
3
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B
4
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C
2
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D
1
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