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QUESTION

# How does effective nuclear charge (Zeff) affect atomic size?

Effective nuclear charge increases from left to right across a period and therefore the atomic radius decreases.

As we go across a period the atomic size decreases due to Effective nuclear charge increases by 0.65 in the 2^(nd) and the 3^(rd) period But for the d block it's 0.15 .

Hope this helps! :)