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

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Strategy:
 Down a group, atomic size increases because new electron shells are added. This increase in distance reduces the attraction between the nucleus and valence electrons, affecting electronegativity ().

Step 1: Evaluate trends down a group
1. Atomic Radius: Increases due to addition of shells.
2. Electronegativity: Decreases as the larger size reduces the atom's ability to attract shared electrons.
3. Ionization Enthalpy: Decreases.

The pair matches: EN decreases and Atomic Radius incre

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