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The graph below shows the atomic radii of atoms in picometers \( (\mathrm{pm}) \) as a function of atomic number. Which letter on this graph most closely shows the location of the transition metals of period 5? Atomic Radius vs. Atomic Number

1. Region E
2. Region D
3. Region \( c \)
4. Region B

Correct answer: Region D

Solution

The transition metals in period 5 are the 4d elements, which appear in the middle of the period and typically show a relatively flat, moderate atomic-radius trend. On the graph, Region D best matches that middle d-block section.

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