why radius of palladium and Platinum are approximately same
Dear Student
The atomic radii of Platinum is 139 pm and that of Palladium is 137 pm, whereas the covalent radius is 136 pm and 139 pm respectively. 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. Therefore, the third row elements have the same size as that of the elements that lies above them in the periodic table and this offers them similar structure characteristics and chemistries.
Regards
The atomic radii of Platinum is 139 pm and that of Palladium is 137 pm, whereas the covalent radius is 136 pm and 139 pm respectively. 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. Therefore, the third row elements have the same size as that of the elements that lies above them in the periodic table and this offers them similar structure characteristics and chemistries.
Regards