= Graeme W. Watson
{c}
<Graeme W. Watson> coauthored research on <lone pair>.<The origin of the stereochemically active Pb(II) lone pair: DFT calculations on PbO and PbS by Aron Walsh and Graeme W. Watson>[publication title and author list]{ref}
A <lone pair> is an <electron pair> assigned to one <chemical atom> without a connecting line to another <chemical atom> in a <Lewis structure>. It is usually shown as two dots. <Water> has two <lone pairs> on <oxygen>, accounting for four <valence electrons>; <Ammonia> has one <lone pair> on <nitrogen>, accounting for two. In $\mathrm{O=C=O}$, each <oxygen> has two <lone pairs>, and <carbon> has none.
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