Posted by Anonymous on Monday, January 25, 2010 at 1:38am.
Yes it is but I think your confusion may result in your reasoning. The fact you quoted is the RESULT of the trends in electron configuration.
The reason the radii increase as one moves DOWN the table is because additional shells are being filled. (Note that H has just 1 shell (n=1), Li has two shells (n = 1 and 2), Na has three (period 3) etc. The reason radii decreases as one moves from left to right in the table is because the atomic number (number of protons in the nucleus) is increasing but the shell remains the same; therefore, the increasing positive charge in the nucleus is pulling the electrons closer.
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