The correct order of atomic radii in group 13 elements is

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🧠 The Group 13 Anomaly
Usually, atoms get bigger as they go down a group. But in Group 13, the transition from Aluminum to Gallium hits a "density bump" because of the weak shielding of the  freshly filled -electrons.

🗺️ The Structural Mapping
1. The -block Contraction: Gallium () comes right after the  transition series. Those -orbitals are bad at shielding the outer electrons from the nuclear charge.
2. Result: The nucleus pulls the valence electrons of Gallium tighter than expected, making

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