Lone Electron Pair

[casper22]

---

Members do not see this ad.

This one from the Destroyer.. Q 164 in 2010

The question is..how many lone electron pairs are found in AsBr3.

I drew the molecular structure to find that it is an sp3 and trigonal pyramidal gerometry... however the answer says there are 10 electron pairs and I am not just to identify them...what am I missing..

On a different note... PAT is killing me... I have taken 3 CDP's (took the 3rd today) and have been scoring 19, 18 and 18... how do I cross that 20...I want to do that once before the 5th test and then continue the trend for the last 5.. any suggestions...

 

[MSUstudent]

This one from the Destroyer.. Q 164 in 2010

The question is..how many lone electron pairs are found in AsBr3.

I drew the molecular structure to find that it is an sp3 and trigonal pyramidal gerometry... however the answer says there are 10 electron pairs and I am not just to identify them...what am I missing..

On a different note... PAT is killing me... I have taken 3 CDP's (took the 3rd today) and have been scoring 19, 18 and 18... how do I cross that 20...I want to do that once before the 5th test and then continue the trend for the last 5.. any suggestions...

Okay so.. for AsBr3 there are 26 total electron

Drawing the lewis dot structure you can see that only 6 of the electrons are used for bonding. In total there are 10 lone pair electrons that are non-bonding. 3 around each Br and 1 pari on the As.

I think that is all they're asking.

 

[casper22]

oh ok...that makes sense... such a simple concept and I got so confused...

Thanks...