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Question

Which of the following pairs show reverse properties on moving along a period from left to right and from top to bottom in a group?

A
Atomic radius and electron gain enthalpy (negative value)
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B
Nuclear charge and ionisation enthalpy
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C
Ionisation enthalpy and electron gain enthalpy (negative value)
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D
None of the above
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Solution

The correct option is A Atomic radius and electron gain enthalpy (negative value)
Atomic radius decreases from left to right in a period and increases from top to bottom in a group. Similarly, the negative value of electron gain enthalpy decreases in a period and increases in a group. So Atomic radius and electron gain enthalpy show reverse properties on moving along a period from left to right and in the group from top to bottom.

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