Which of the following trends is correct when moving from left to right across Period 3 of the Periodic Table?
The oxides change from basic to amphoteric to acidic.
The atomic radius increases.
The first ionization energy decreases.
The metallic character increases.
📝 Detailed explanation
Across Period 3: Na and Mg form basic oxides, Al forms an amphoteric oxide, and Si, P, S, and Cl form acidic oxides. Atomic radius decreases and ionization energy generally increases.
