Question

the atomic radii of palladium and platanum are nearly same, why❓​

Answer 1

Answer:

· The major reason behind the same is presence of valence s-orbitals, and lanthanide contraction and relativity effects on account of which the third row transition elements experience contraction and this thus, makes them smaller than expected.

Answer 2

Answer:

This is because of Lanthanide Contraction.

Explanation:

Pd belongs to gr no 5 whereas Pt belongs to gr 6.After the first element in 6d series i. e. gr 6 4 f shell is added and eleletrons enter that shell. As we know because of the deffused shape of f orbital it has very poor shielding effect and that causes contraction in the size of atom. That is the reason Pd and Pt have same atomic radii though they belong to different periods.