electronegativity trends Cl vs. I

[destroythemcat]

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Why is Cl more electronegative than I?
TPR give this explanation "because decreased nuclear shielding allows for a stronger pull on the valence electrons"

Why does Cl have decreased shielding? Isnt the Zeff the same?……..help anyone

 

[Teleologist]

Why does Cl have decreased shielding? Isnt the Zeff the same?……..help anyone

Zeff of Cl is the same as what?

Also the book is right.

 

[sillyjoe]

It is my understanding that less electrons = less shielding by the inner shell electrons and therefore the protons in the nucleus of chlorine hold the electrons closer to the nucleus and each electron feels a greater average "pull" towards the nucleus making it more electronegative.