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The first, se...

Question

The first, second, third, fourth and fifth ionisation potential values of an element are $6.11, 11.87, 51.21, 67.0, 84.39 e V$ respectively. The element is:

A

Calcium

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B

Potassium

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C

Aluminium

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D

Carbon

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Solution

The correct option is A Calcium
The third ionisation potential of the given element is very large as compared to the first and second ionisation potential.

Therefore the given element should have two electrons in the outermost shell. Thus the given element is an alkaline earth metal.

Calcium has 2 electrons in its outermost shell.

Option A is correct.

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