Question

what is the reason for lanthanoid contraction

Answer 1

what contraction? what?

Answer 2

lanthanoid contraction

Answer 3

I have never heard of this before, but you can read about it here: http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descriptive_Chemistry/Transition_Metals/The_Lanthanides/Lanthanide_Contraction

Answer 4

ok

Answer 5

thanks

Answer 6

The Lanthanide Contraction describes the atomic radius trend that the Lanthanide series exhibit. Another important feature of the The Lanthanide Contraction refers to the fact that 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.