The successive 5 ionisation energies of an element are 800, 2427, 3658, 25024 and 32824 kJ/mol, respectively. By using the above values predict the group in which the above element is present: [2025]

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Solution

Q.
The successive 5 ionisation energies of an element are 800, 2427, 3658, 25024 and 32824 kJ/mol, respectively. By using the above values predict the group in which the above element is present: [2025]

1 Group 14

2 Group 13

3 Group 4

4 Group 2

Ans.
(2)

There is huge jump on moving from $I E_{3}$ to $I E_{4}$ . This means removing fourth electron is very difficult. In other words, removing three electrons are relatively easy. i.e. the element has 3 valence electrons. So it is a group 13 element.

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