why are the reduction potenials of K, Cs, Rb close?
- rpm92Lv 61 decade agoFavorite Answer
The lanthanide series starts at principal quantum number 4, same as K
The extra volume available to the 4, 5 & 6 's' orbitals due to these 7 f-orbitals lowers electron density and core electron repulsions. The effect is known as the lanthanide contraction. It reduces the differences between consecutive periods for several physical properties including reduction potential.
- maussyLv 71 decade ago
They are all in the group1 which has 1 electron on the outer or valence shell and for this reason very near physical and chemical properties