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**1. Homework Statement**

In xenon (Z = 54), what is the effective charge Zeff experienced by an electron in the M (n=3) shell?

**2. Homework Equations**

Zeff = Z - total electrons in K and L shells

**3. The Attempt at a Solution**

I think total electrons in K shell are 8 and in L shell are 18

then Zeff = 54-26 = 28

but I got wrong..

please help me..