AIIMS 2019 Chemistry Atomic and Ionic Radii MCQ Question

In the given order of covalent radii, Ni (125 pm) has the smallest radius due to its higher effective nuclear charge compared to Cu (128 pm) and Zn/Mn (137 pm), which leads to a stronger attraction between the nucleus and the valence electrons, resulting in a smaller atomic size. The other options are not applicable as they do not provide any alternative covalent radius values or relevant information for comparison. Understanding covalent radii is crucial as it influences molecular geometry and reactivity in chemical bonding.