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How do you know when to draw a single/double/triple bond when drawing Lewis Structures? I need a good answer because I still don't understand Lewis Strucctures.

2.BOND MATH!

-Used to determine the total number of bonds in a molecule or ion

-Forumula: Number of Bonds = (number of octet electrons - number of valance electrons)/(2)

-Example of Bond math: PCl3. There are 4 atoms so 4 times 8 (octet) = 32. And P (5 valance) plus 7 times 3 (three Cl atoms in the molecule and Cl has 7 valence electrons) equals 26. So, (32-26)/(2)= 3 Bonds.

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