farther right the element appears in a period, which matches the trend we saw for the
main-group elements. However, there are some interesting details in the data shown in
Interactive Figure 23.1.3.
● Atomic size decreases as you move across a period, but the change is not as significant
as was observed for the main-group elements.
● Atomic size decreases from Sc to Mn but then levels out.
● Atomic size increases slightly at the right side of the d-block.
● Within groups, the period 5 transition metals are larger than the period 4 transition
metals but are the same size or only slightly smaller than the period 6 transition
metals.