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)
• B. Nuclear charge and ionisation enthalpy
• C. Ionisation enthalpy and electron gain enthalpy (negative value)
• D. None of the above

Answer 1

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.