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Lewis structures & molecule shapesPowerPoint Presentation

Lewis structures & molecule shapes

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## PowerPoint Slideshow about ' Lewis structures & molecule shapes' - spencer

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Presentation Transcript

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

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!

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!

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

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

- Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules
- AlF3
- SiO2
- SF2
- PCl3

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

Practice

- Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules
- CHF3
- CO2
- COF2
- GaBr3
- Na2S

Practice

- CHF3 AB4 Tetrahedral
- CO2 AB2 Linear
- COF2 AB3 Triagonal Planar
- GaBr3 AB3 Triagonal Planar
- Na2SAB2E2Bent

Practice

- NF3
- CO3-2
- CF4
- POH
- C2H2

Practice

- NF3 AB3E Trigonal Pyramidal
- CO3-2AB3 Triagonal Planar
- CF4 AB4Tetrahedral
- POHAB2EBent
- C2H2 AB2 Linear (both carbons)

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