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The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol⁻¹. The number of valence electron in the element is -

1. (1) 3
2. (2) 4
3. (3) 5
4. (4) 2

Correct answer: (1) 3

Solution

Successive IEs 800, 2427, 3658 then a huge jump to 25024 indicate three easily-removable electrons before reaching a stable core. Therefore the element has 3 valence electrons.

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