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Draw the Lewis structure for sulfur trioxide, SO3.

Explanation:

Sulfur has valence electron 6 and oxygen has 6*3 = 18 valence electrons. In this drawing, you'll see that sulfur violates the octet rule that is it has more than 8 electrons but it is legal since sulfur is in 3rd period, and elements that fall in 3rd period or more in periodic table can use their d orbitals and others to go beyond the normal "8" electrons in valence shell rule which is octet rule

All the formal charges are minimized...that is everything has formal charge of 0 in this structure which is always encouraged.

Credits to chemistNATE who wonderfully explains it in his video.

tracks, burrows, eggshells, nests, tooth marks, or gastroliths