Shape of molecules and ions

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Created by
Ema

Cards (12)

  • Electron pairs must be a bonded pair or a lone pair, the pairs can be decided by drawing a dot and cross diagram
  • Electron repulsion theory
    • Each pair of electrons around and atom will repel all other electron pairs
    • The pairs of electrons will therefore take up a position as far away as possible to minimise any repulsion in a molecule
  • Non-linear
    BP: 2
    LP: 2
    Angle: 104.5
  • Linear
    BP: 2
    LP: 0
    Angles: 180
  • Trigonal Planar
    BP: 3
    LP: 0
    Angle: 120
  • Pyramidal
    BP: 3
    LP: 1
    Angle: 107
  • Tetrahedral
    BP: 4
    LP: 0
    Angle: 109.5
  • Square Planar
    BP: 4
    LP: 2
    Angle: 90
  • Trigonal Bipyramidal
    BP: 5
    LP: 0
    Angle: 120, 90
  • Octahedral
    BP: 6
    LP: 0
    Angle: 90
  • Some molecules have unshared pairs of electrons; electrons not part of a covalent bond
  • Repulsion

    BP-BP < LP-BP < LP-LP
    BP-BP has the least repulsion
    LP-LP has the greatest repulsion