effective nuclear charge: decreasing down a column?

[phosphatase]

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effective nuclear charge: decreasing down a column? Am I right? I got conflicting infos. thanks

 

[Onix]

effective nuclear charge: decreasing down a column? Am I right? I got conflicting infos. thanks

Z=effective nuclear charge.

Z decreases going down a column b/c as you down the column you are adding layers, think of it as insulating layer,thus the farthest electron feels the least pull from the nucleus. Z increases going from left to right b/c we are adding protons as we go across the table.