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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.
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Comments
November 19, 2009 - 18:43.
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.
January 12, 2010 - 12:42.
It is because - potassium has empty inner d-orbitals
February 18, 2011 - 03:10.
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