The atomic size of Gallium () is anomalously smaller than Aluminium (). What is the exact primary ca — Periodic Table and Periodicity Chemistry Question
Question
The atomic size of Gallium ($Ga$) is anomalously smaller than Aluminium ($Al$). What is the exact primary cause of this anomaly?
Answer: C
💡 Solution & Explanation
Gallium is preceded by the 3d transition series. The 10 inner 3d electrons shield the nucleus poorly, sharply increasing $Z_{eff}$ and contracting the valence shell, making $Ga \approx Al$.
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