Which of these transition elements has the largest atomic radius?

Question

Quizplus · Accepted Answer

Hf (Hafnium) has the largest atomic radius among the given transition metals. This is because Hafnium has the highest atomic number (72) and as we move from left to right in a period, atomic radius decreases due to the increase in the number of protons in the nucleus, leading to a stronger attractive force on the electrons. However, within a group, from top to bottom, atomic radius increases due to the addition of a new shell of electrons. Therefore, Hf being at the bottom of the group has the largest atomic radius.

Which of These Transition Elements Has the Largest Atomic Radius