The Lewis Structure, or Lewis Dot Diagram, shows the bonding between atoms of a molecule and any electrons that may exist. The Lewis Structure for Li is Li with one dot to the right of the element.
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The Lewis structure for lithium (Li) consists of the symbol "Li" with a dot representing its valence electron. Since lithium has only one valence electron, it is shown as a single dot around the "Li" symbol.
the Lewis structure for Na is
.
Na
one dot on top, representing the single electron in its outer shell
In the Lewis structure for LiCl, there are 1 valence electron from lithium (Li) and 7 valence electrons from chlorine (Cl) that need to be accommodated. This gives a total of 8 valence electrons in the Lewis structure for LiCl.
The Lewis structure for a nitric oxide ion (NO) has a nitrogen atom in the center with a single bond to an oxygen atom and a positive charge on the nitrogen atom.
The Lewis structure for NH3 shows nitrogen in the center with three hydrogen atoms bonded around it. Each hydrogen atom is connected to the nitrogen atom by a single bond.
It is a lewis base because of its lone pair of electrons that can be "donated". If you draw/look at the lewis structure it is much easier to tell. Especially when the formula is not that of an ion!
The Lewis structure for calcium nitride (Ca3N2) consists of one calcium atom with two nitrogen atoms bonded to it. The calcium atom donates two electrons to each nitrogen atom, forming ionic bonds. The calcium atom has a 2+ charge, while each nitrogen atom has a 3- charge.