Could anybody help me with this? The atomic radii of the transition metals show some anomaly in their atomic radii as compared to those elements in Group 1A-7A, which generally shows a decrease as one goes from left to right in a period. The atomic radii of the transition metals decrease as do those in Groups 1A-7A, but then they increase. For example, Sc has an atomic radius of 162 pm and the atomic radii decrease until Ni to 124 pm, but Cu an Zn have larger atomic radii than Ni and Zn is even larger than Cu. How do you explain this?