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Shape of Molecules
12/04/2023
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Shapes of molecules. VSEPR-Valance shell electron pair repulsion. • Each pair of elections around an atom will repel each other O The e pairs will position themselves as far apart from each other to minimise repulsion and achieve the most stable arrangement. • e-pair may be a lone pair, these repel more than a bandling pair. SHAPES → Linear 2 election pairs Bond Angle 180° → Tetrahedral 4 electron pairs Bond angle 109.5° Beci₂ BE Octahedral 6 election pairs. Band angle 90° Trigonal Planar XO DO 3 electron pairs Bo Ft B Bond angle 120° CH₂ ISF F xo 00 •Cl&Be&C₁ (C1-Be-C1) CI 8F8 CI → Trigonal by pramidad crop SCT IPCIS) a Selection pairs crack Band angies of 90° 12.0° F xo F O OF % oc it ox H H-014 1201 90 ci sidle 120- €1451 F H Lone pair-lone pair repulsion decreases band angle to lo5º. VAN 4H # 90° F →Bent Based on 4 election pour terrahedral H₂O 2 banding pairs 2 lone pairs → Pyramidal •4 election pairs • Based on terahedral • 8 bonding electron pairs. • Flone pair of electrons 0 More repulsion clecreases band angle to 107 degrees. INH1 back of macale Octahedral. not visible. 7 Square planar Based on 6 election pair •4 bonding pairs •2 loe pairs C G Band xetu angle still 90° O 20 → Distorted Square Pyramia. *Based on octahedral (6. bonding pairs). Band angles 90°/180° Ilone pair 5 bonding pairs -pane PAN- Bancl angle 89° • when there isn't a 6th bonding pair the bond angle of 180° is lost
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