Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

The densities (in g/cm3) of elements in Croups 6B, 8B, and 1B are given in the table below.


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.


Interpretation Introduction


The sixth period transition metals has greater density than other groups, the reason has to be explained.

Concept Introduction:

Atomic radius: The concept explain chemical element is a measured of the size of its atoms, in other words to measure the distance from the center of the nucleus to the boundary of the surrounding cloud of number of electrons.

Density properties of transition metals: Generally the transition metals possess a high density, high melting points and high boiling points. These properties are due to metallic bonding by delocalized (d-electrons) and leading to cohesion which increases with the number of shared electrons.


As we know the general formula of density,


From the figure, the nuclear volume of the transition elements is much lower than those s- and p-block elements; is due to the filling of

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