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Which pair of periodic properties generally shows a downward trend and an upward trend, respectively, as you move from top to bottom within a group?

1. Atomic size and electronegativity.
2. Electron gain enthalpy and electronegativity.
3. Electronegativity and atomic size.
4. Electronegativity and electron gain enthalpy.

Correct answer: Electronegativity and atomic size.

Solution

As you move down a group in the periodic table, atomic size increases due to the addition of electron shells, while electronegativity decreases because the increased distance between the nucleus and the valence electrons reduces the nucleus's ability to attract bonding electrons.

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