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The first thr...

Question

The first three successive ionisation energies of an element Z are 900, 1757 and 14850 kJ $m o l^{- 1}$ respectively. The element Z belongs to:

group-1

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group-2

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group-15

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group-17

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Solution

The correct option is B group-2
As $I E_{1}$ is not very high, element Z cannot belong to group-15 or group-17. Also, the second I.E. is also not very high, but the third I.E. is very high. Therefore, the element belongs to group 2.

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k J m o l^{- 1}

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