Daily Science Draw the Lewis structure for NO2-1 . How many sigma and pi bonds does it have? Draw the Lewis structure for the following and tell how.

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Presentation transcript:

Daily Science Draw the Lewis structure for NO2-1 . How many sigma and pi bonds does it have? Draw the Lewis structure for the following and tell how many sigma and pi bonds there are SeO3

VSEPR Theory Pg. 53

Molecular shape You can determine the shape of a molecule based on the Valence Shell Electron Pair Repulsion model (VSEPR) Electrons repel each other and determine shape Bond angles are predicted using VSEPR

Steps for VSEPR model Draw Lewis Structure Determine the total number of “things” attached to central atom Things includes bonds and lone pairs A lone pair counts as 1 ‘thing’ Double and triple bonds count as one thing Use the chart to determine the molecular shape Ex. CH4, H2O, and SO3

Total Electron Pairs (‘Things’) Number of bonded electron pairs (atoms) Number of lone pairs of electrons Molecular Shape Bond Angles 2 Linear 180 3 Trigonal Planar 120 1 V-shaped (bent) 104.5 4 Tetrahedral 109.5 Trigonal Pyramidal 107 5 Trigonal Bipramidal 90, 120 Seesaw 90, 120, 180 T-Shaped 90 108 6 Octahedral Square Pyramidal Square Planar

Pg. 54 CS2 CH3Cl PI5 NF3 O2 TeF2 SO32- CH2O SeF6 Formula Total v.e. Lewis Structure Total bonds (‘things’) around central atom # of bonded atoms # lone pair Shape name CS2 CH3Cl PI5 NF3 O2 TeF2 SO32- CH2O SeF6