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The steps are
1) Count the total number of valence electrons
2) Connect all atoms with single bonds
3) Add in lone pairs such that all atoms that want an octet has an octet
4) Count total number of electrons in lewis structure and compare it to the number you calculated in part 1
5) If the number matches up, then you're done!
6) If there are too many electrons, form double or triple bonds
7) If there aren't enough, add lone pairs on central atoms until you have the correct number of electrons
Examples include:
CH2Cl2
HCN
BrF5
By the end of this video, you'll know exactly how to draw lewis structures.
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