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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: jacky_811 on April 19, 2009, 08:40:21 AM

Title: how to find how many pairs of lone pair in a molecule?
Post by: jacky_811 on April 19, 2009, 08:40:21 AM

how to find how many pairs of lone pair in a molecule?

Title: Re: how to find how many pairs of lone pair in a molecule?
Post by: Lilly on April 19, 2009, 11:03:06 AM

You would draw the covalent bonding (shared pair of electrons between atoms) and what ever is left are the lone pair of electrons.

for example in water:
(https://www.chemicalforums.com/proxy.php?request=http%3A%2F%2Fscienceaid.co.uk%2Fchemistry%2Ffundamental%2Fimages%2Fwater.jpg&hash=b2de32fba93983161c7e4be8fd46440953c2b30f)

This molecule has 2 pairs of lone pairs of electrons (those not involved in bonding).

Hope this helps :)