Lewis structures molecule shapes
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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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Lewis structures & molecule shapes

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Lewis structures molecule shapes

Lewis structures & molecule shapes


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

  • AlF3AB3 Triagonal Planar

  • SiO2 AB2Linear

  • 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

  • CHF3AB4 Tetrahedral

  • CO2 AB2Linear

  • 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

  • NF3AB3ETrigonal Pyramidal

  • CO3-2AB3 Triagonal Planar

  • CF4 AB4Tetrahedral

  • POHAB2EBent

  • C2H2 AB2 Linear (both carbons)


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