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Question:

In general, the properties that decrease and increase down a group in the periodic table, respectively, are:

electronegativity and atomic radius.

electronegativity and electron gain enthalpy.

atomic radius and electronegativity

electron gain enthalpy and electronegativity

Solution:

The correct option is B electronegativity and atomic radius. Electronegativity decrease as we go down the group and atomic radius increase as we go down the group.