shapes

• what are bonding pairs ?

  shared pair of electrons
• what are lone pairs ?

  unshared electrons
• how do pairs of electrons exist as ?

  charge clouds
• what is the electron pair repulsion theory ?

  electrons repel eachother as far as possible so the arrangment minimises repulsion and this holds the bonded atoms in a definite shape
• does lone pairs or bonded pairs have a higher repulsion strength

  lone pairs because the lone pair of electrons is slightly closer to the nucleus and occupies more space resulting in a stronger repulsion then bonding pairs
• whats the order of repulsion

  lp/lp > lp/bp > bp/bp
• what is the shape and angle of a molecule with 2 bonding pairs and no lone pairs ?

  linear and 180 degrees
• what is the shape and angle of a molecule with 3 bonding pairs and no lone pairs ?

  trigonal planar and 120 degrees . bonding pairs repel eachother equally
• what is the shape of a molecule with 3 bonding pairs and one lone pair ?

  non linear and 117.5 degrees . lone pairs repel eachother more then bonded pairs
• whats the shape of a molecule with 4 bonding pairs and no lone pairs ?

  tetrahedral and 109.5 degrees
• whats the shape of a molecule with 3 bonding pairs and one lone pair ?

  trigonal pyramidal and 107 degrees
• whats the shape of the molecule with 2 bonding pairs and 2 lone pairs ?

  non linear and 104.5 degrees
• whats the shape of a molecule with 5 bonding pairs and no lone pairs ?

  trigonaly bypyramidal 90 and 120 degrees
• whats the shape of a moleucle with 6 bonding pairs

  octahedral and 90 degrees
• if a molecule had a double bond between atoms how do you treat it

  as a single bond for example c02
• how do you do the shapes for ions

  same principle (draw a dot and cross diagram)