The successive ionization energies for element X are given below: IE1=250kJ mol−1 IE2=820kJ mol−1 IE3=1100kJ mol−1 IE4=1400kJ mol−1
Find out the number of valence electrons from 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 D1 According to the given data, there is a large jump from first to second ionization energy. The second ionization energy is more than thrice the first ionization energy. This indicates that the species attains stable electronic configuration after the removal of one electron. Hence, the number of valence electron is 1. This indicates that element X belongs to alkali metal group.