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Lewis structures & molecule shapes. AB or AB 2 – linear. If there are only two atoms the shape will be linear – there are no unshared electrons around the central atom H 2 is a great example of linear, as is HCl CO 2 is also linear. AB 3 – Trigonal Planar.

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ab or ab 2 linear
AB or AB2 – linear
  • If there are only two atoms the shape will be linear – there are no

unshared electrons

around the central atom

  • H2 is a great example of linear, as is HCl
  • CO2 is also linear
ab 3 trigonal planar
AB3 – Trigonal Planar
  • There are three atoms and the central atom does not have any unshared pairs of electrons
  • BF3 is an example, so is CH2O
  • The Lewis Structure will have 3 pairs around the central atom being shared with other atoms, and no other electrons around the central atom!
ab 4 tetrahedral
AB4 - Tetrahedral
  • There are four atoms bonded to the central atom with no unshared pairs of electrons on the central atom.
  • CH4 is an example
  • The Lewis Structure will have 4 pairs of electrons shared between the central atom and other atoms, with no other electrons around the central atom!
ab 3 e trigonal pyramidal
AB3E – Trigonal Pyramidal
  • Three atoms are bonded to the central atom, and the central atom has one pair of unshared electrons.
  • NH3 is an example
  • The Lewis Structure will have one unshared pair of electrons around the central atom as well at the other three pairs bonded to the three atoms
ab 2 e or ab 2 e 2 bent or angular
AB2E or AB2E2 – Bent or Angular
  • The central atom has two atoms bonded and two pair of unshared electrons
  • H2O is an example
  • The Lewis Structure will have two unshared pair of electrons around the central atom and two other pairs of electrons bonded to other atoms
practice
Practice
  • Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules
  • AlF3
  • SiO2
  • SF2
  • PCl3
practice1
Practice
  • Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules
  • AlF3 AB3 Triagonal Planar
  • SiO2 AB2 Linear
  • SF2 AB2E2 Bent or Angular
  • PCl3 AB3 ETriagonal Pyramidal
practice2
Practice
  • Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules
  • CHF3
  • CO2
  • COF2
  • GaBr3
  • Na2S
practice3
Practice
  • Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules
  • CHF3 AB4 Tetrahedral
  • CO2 AB2 Linear
  • COF2 AB3 Triagonal Planar
  • GaBr3 AB3 Triagonal Planar
  • Na2SAB2E2Bent
practice4
Practice
  • Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules
  • NF3
  • CO3-2
  • CF4
  • POH
  • C2H2
practice5
Practice
  • Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules
  • NF3 AB3E Trigonal Pyramidal
  • CO3-2AB3 Triagonal Planar
  • CF4 AB4Tetrahedral
  • POHAB2EBent
  • C2H2 AB2 Linear (both carbons)
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