whil asked in Science & MathematicsChemistry · 1 decade ago

why are the reduction potenials of K, Cs, Rb close?

2 Answers

  • rpm92
    Lv 6
    1 decade ago
    Favorite 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.

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  • maussy
    Lv 7
    1 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

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