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Linear molecule- composed of two covalently bonded atoms
Trigonal planar molecule- composed of 3 bonded atoms- this represents a molecule that displays an exception to the octet rule.
3 clouds around the central atom or 3 "things"
Tetrahedral molecule- contains 4 clouds " 4 things" around the central atom- The repulsion is such that 109.5 degree angles are formed
Non bonding pairs are more commonly known as lone pairs of electrons
4 "things" off of the central atom- all "things" electron clouds repel eachother
trigoanal planar- only "3 things" clouds off of the central atom