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GCSE Chemistry · key term
The pattern of which atoms are bonded directly to which other atoms in a structure.
Used by OCR
Specification CM2.3i · Paper 1 (Foundation), Paper 3 (Higher)
Revise: 3D Chemical RepresentationsA displayed formula makes connectivity clear. A perspective drawing or ball-and-stick model makes the spatial arrangement easier to see. However, the balls and sticks are enlarged teaching devices: atoms are not solid coloured balls joined by physical rods, and their sizes and separations may not be to scale.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The pattern showing which atoms are directly joined to which other atoms.
When describing a model's limitation, be specific: for example, a displayed formula shows connectivity but not necessarily the three-dimensional arrangement.
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Label the atoms, then compare the atom count and connectivity with the model.