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Trends in Modern Periodic Table

Which of the ...

Question

Which of the following properties shows a clear periodic variation?

A

First ionisation energy

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B

Molar mass of the element

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C

Number of isotopes of the atom

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D

All of the above

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Solution

The correct option is A First ionisation energy
Molar mass depends upon neutron also and they doesnt follow periodic variation, so molar mass doesn't show periodic variation.
Similarly, number of isotopes depends upon a particular element.
But IP follow periodic variation according to configuration.

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