Effective Nuclear Charge

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Effective Nuclear Charge Rate Topic:

#1 10 January 2012 - 04:41 AM blazinfury

Quark

Effective Nuclear Charge (Zeff) is defined as how tightly the valence e- are held. I understand that Zeff decreases down a group because there is an increase in the number of principle energy levels (PEL) and as such, the valence e- are further away from the nucleus. However, Zeff increases left to right across a period. I am trying to understand this, but am having a difficult time. I understand that the number of protons and e- increase across a period, but how is that conducive to a tighter attraction with the nucleus?

Thanks.