Lewis structures & molecule shapes. AB or AB 2 – linear If there are only two atoms the shape will be linear – there are no If there are only two atoms.

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Presentation transcript:

Lewis structures & molecule shapes

AB or AB 2 – linear If there are only two atoms the shape will be linear – there are no 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 H 2 is a great example of linear, as is HCl CO 2 is also linear CO 2 is also linear

AB 3 – Trigonal Planar There are three atoms and the central atom does not have any unshared pairs of electrons There are three atoms and the central atom does not have any unshared pairs of electrons BF 3 is an example, so is CH 2 O BF 3 is an example, so is CH 2 O The Lewis Structure will have 3 pairs around the central atom being shared with other atoms, and no other electrons around the central atom! 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 There are four atoms bonded to the central atom with no unshared pairs of electrons on the central atom. There are four atoms bonded to the central atom with no unshared pairs of electrons on the central atom. CH 4 is an example CH 4 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! 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 Three atoms are bonded to the central atom, and the central atom has one pair of unshared electrons. Three atoms are bonded to the central atom, and the central atom has one pair of unshared electrons. NH 3 is an example NH 3 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 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 The central atom has two atoms bonded and two pair of unshared electrons The central atom has two atoms bonded and two pair of unshared electrons H 2 O is an example H 2 O 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 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 Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules AlF 3 AlF 3 SiO 2 SiO 2 SF 2 SF 2 PCl 3 PCl 3

Practice Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules AlF 3 AB 3 Triagonal Planar AlF 3 AB 3 Triagonal Planar SiO 2 AB 2 Linear SiO 2 AB 2 Linear SF 2 AB 2 E 2 Bent or Angular SF 2 AB 2 E 2 Bent or Angular PCl 3 AB 3 E Triagonal Pyramidal PCl 3 AB 3 E Triagonal Pyramidal

Practice Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules CHF 3 CHF 3 CO 2 CO 2 COF 2 COF 2 GaBr 3 GaBr 3 Na 2 S Na 2 S

Practice Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules CHF 3 AB 4 Tetrahedral CHF 3 AB 4 Tetrahedral CO 2 AB 2 Linear CO 2 AB 2 Linear COF 2 AB 3 Triagonal Planar COF 2 AB 3 Triagonal Planar GaBr 3 AB 3 Triagonal Planar GaBr 3 AB 3 Triagonal Planar Na 2 S AB 2 E 2 Bent Na 2 S AB 2 E 2 Bent

Practice Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules NF 3 NF 3 CO 3 -2 CO 3 -2 CF 4 CF 4 POH POH C 2 H 2 C 2 H 2

Practice Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules Draw the Lewis Structure (or electron dot diagram) and then determine the shape for the following molecules NF 3 AB 3 ETrigonal Pyramidal NF 3 AB 3 ETrigonal Pyramidal CO 3 -2 AB 3 Triagonal Planar CO 3 -2 AB 3 Triagonal Planar CF 4 AB4 Tetrahedral CF 4 AB4 Tetrahedral POH AB 2 E Bent POH AB 2 E Bent C 2 H 2 AB 2 Linear (both carbons) C 2 H 2 AB 2 Linear (both carbons)