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Why Eu ropium shows a sudden increase in atomic radius. (At. Radius of Sm = 180pm , Eu = 199pm and Gd = 180 pm)?

Why Europium shows a sudden increase in atomic radius. (At. Radius of Sm = 180pm , Eu = 199pm and Gd = 180 pm)?

Grade:12

2 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
Actually there is confusion in you.The atomic radius which I found was all the same for the three element as 180 pm.
Lets see,there is a decrease in atomic radius There is a decrease in the atomic radius due to lanthanide contraction which means the 5s and 5p orbitals penetrate the 4f sub-shell so the 4f orbital is not shielded from the increasing nuclear change, which causes the atomic radius of the atom to decrease. This decrease in size continues throughout the series.
Actual
atomic radius -
Samarium-2.58 A
Europium- 2.56 A
Gadolinium-2.54 A
Shibashis Mallik
21 Points
9 years ago
@Sunil Kumar FP
Go to this link and check Table 8.9 on pg.229
 
ncertbooks.prashanthellina.com/class_12.Chemistry.ChemistryI/8.pdf

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