Transition metals in the sixth period all have much greater densities than the elements in the same groups in the fourth and fifth periods. Refer to Figure 7.8, and explain this observation.

Data given in Figure 7.8

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Radius (pm) 250 200 150 100 Period LO Cs 4 Rb K Ca 1A Zr W Nb Sc Ti 2A 3B V 4B Size increases Re Mo Tc Cr Os 6th Period 5th Period 4th Period Ir Ru Rh Mn Fe 5B 6B 7B Pt Transition metals Au Pd Ag Co Ni 8B Hg Cu 250 200 150 Cd Zn Figure 7.8 Trends in atomic radii for the transition elements. Atomic radii of the Group 1 A and 2A metals and the transition metals of the fourth, fifth, and sixth periods. 1B 2B Size increases on descending a Group