(Polar molecules, Non-polar molecules, etc.)
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The notation would be AX3 because there are three atoms attached to Nitrogen in the Lewis structure. The amount of bonds does not really matter, but the amount of atoms surrounding the central atom is relevant. The geometry is trigonal planar.
The formula would be AX3 because there are three regions of electron density surrounding the central atom. They are all bonded pairs of electrons, so the formula would include X3. If any of the regions of electron density included lone pairs of electrons, you would have to use the E part of the formula.
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