The first, second, third, fourth and fifth ionisation potential values of an element are 6.11,11.87,51.21,67.0,84.39eV 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.