The definition of 'shielding'

1. Dec 18, 2004

Now this relates to the berylium + Lithium thread i made earlier.. (although not entierly)

Is electron 'shielding' due to replusion between electron orbitals?

http://facultyfp.salisbury.edu/dfrieck/htdocs/212/rev/zeff/shielding.htm

I've had a look at this site, but in somewhat generalizes too much for me. Therfore, can i presume the electrons which occupy the 'inner' orbitals cancel out some of the values of the nuclear charge?

2. Dec 18, 2004

GCT

You need to read up more on the topic of effective nuclear charge (Z). Browse through the index of your text.

Why does electronegativity increase as you move across a specific row of the periodict table?

Last edited: Dec 18, 2004
3. Dec 18, 2004

Ill certainly do that, however, it seems to me the textbooks i have (provided from school) generalizes too much, just saying 'electron shielding causes lower ionisation energy...etc'

I just got a new book (which seems good) so ill read through it, however, it would be appreciative to have one here..

4. Dec 18, 2004

Gokul43201

Staff Emeritus
Roughly speaking, yes, that is what shielding is. The inner electrons "shield" the outer electrons from the field due to the nucleus.

5. Jan 8, 2005

omagdon7

It happens in transition elements more often than in main group elements. Basically since electrons fill in the 4s orbital before the 3d the new 3d electrons shield the 4s orbital from the nuclear charge of the nucleus as they are in a lower energy orbital and thus between the 4s orbital and the nucleus. Also I am really drunk so if something was omitted or factually incorrect my bad.