Each outer atom needs three electron pairs, since it already has one bonding pair. The outer atoms are the oxygen atoms here. Step 3) Add electrons to all outer atoms (except H) to complete their octets. Step 2) Attach the atoms to each other using single bonds (“draw the skeleton structure”) The final answer MUST have this number of electrons‼! The -2 charge means that there are 2 extra electrons Step 1) Figure out how many electrons the molecule must have. Otherwise, repeat this process until the central atom has 8 electrons.Įxample: drawing the Lewis structure of CO 3 2 – If the central atom now has 8 electrons around it, you’re finished.
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