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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Solution
The correct option is B1 There are in all four ionisation energies given. That means after losing the fourth electron, noble gas configuration comes. So the number of valence electrons is 1.