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The atomic radii of the elements are almost same of which series

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By Expert Faculty of Sri Chaitanya
a
Li - Be - B
b
Na - K - Rb
c
F - Cl - Br
d
Fe - Co - Ni
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detailed solution

Correct option is D

Fe - Co- Ni. With the increase in the d-electrons, screening effect increases, this counter balances the increased nuclear charge due to increase in atomic number. As a result atomic radii remain practically same after chromium.

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Statement 1: The metals of 4d and 5d transition series have greater enthalpies of atomization than the corresponding elements of the 3d series.

Statement 2: The metal bond in 4d and 5d series are stronger than those in the 3d series.

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