Plz explain as well
Dear student
Option (3) Ru and Rh have identical sizes.
This is because of Lanthanide contraction.{The poor shielding effect of the 4f electrons is the main cause of lanthanide contraction. The 4f electrons shield the outer electrons from the nuclear charge poorly. Due to this, the outer electrons experience more nuclear charge which results in a decrease in atomic radius of lanthanides. }
This makes the atomic radii of Platinum group metals {Ru and Rh )similar.
Regards
Option (3) Ru and Rh have identical sizes.
This is because of Lanthanide contraction.{The poor shielding effect of the 4f electrons is the main cause of lanthanide contraction. The 4f electrons shield the outer electrons from the nuclear charge poorly. Due to this, the outer electrons experience more nuclear charge which results in a decrease in atomic radius of lanthanides. }
This makes the atomic radii of Platinum group metals {Ru and Rh )similar.
Regards