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AP Chemistry Problem comparing Atomic Radi

Oct 21, 2009

The difference between atomic radii of Na and K is large compared to the difference of atmoic radii of Rb and Cs. Explain in terms of principle, atomic structure, include number properties, arrangement of subatomic particles.

Can anyone explain how to figure this out?
Thank you!


mhartnag's picture

Although they are all group I atoms, Na and K have a nuclear charge representative of s,p,and d electrons. Once you get to Rb the 4f sublevel comes into play along with the significantly increase nuclear charge. As a result, the does not increase as significantly as the Na and K.

adianadiadi's picture

It is because - potassium has empty inner d-orbitals

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