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EK and PR content conflict - effective nuclear charge


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OK I'm really confused over the Zeff concept. EK says Zeff (effective nuclear charge) increases going left to right, and from top to bottom. however PR says it increases going left to right and DECREASES from top to bottom. The PR explanation makes total sense - adding more shells as you go down a family results in valence electrons being further and further away each subsequent period (and more inner core electrons) = more shielding = smaller Zeff.


I'm not 100% sure as to why EK says it increases top to bottom. My course companion (class notes) say it increases slightly moving top to bottom.


If someone could clarify for me, I'd appreciate it.

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