The atomic radius of Gallium () is observed to be slightly less than or almost equal to that of Aluminium (). This anomalous behavior is primarily attributed to:

Question

The atomic radius of Gallium ($Ga$) is observed to be slightly less than or almost equal to that of Aluminium ($Al$). This anomalous behavior is primarily attributed to:

Prashant Kotian · Accepted Answer

Correct answer: C. Gallium comes immediately after the first row of d-block (transition) elements. The ten -electrons offer poor shielding of the increased nuclear charge. This increases the effective nuclear charge () on the valence electrons, pulling them closer to the nucleus and causing a reduction in size known as transition contraction, where .

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