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Can somebody please show to me the calculation of effective nuclear charge of atoms of element down the group 2 by using the Slater's rule??

I calculate by using the information from

**http://en.wikipedia.org/wiki/Slater's_rules**.

many books mention that increment in atomic radius down the group 2 is caused by the decreasing effective nuclear charge. is it true? Thanks for your help and i really need all your help.