5n rules Polyhedral skeletal electron pair theory

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5n cluster: p4



5n + 3 cluster: p4s3



5n + 6 cluster: p4o6



the 5n rules follows.



example: p4



electron count: 4 × p = 4 × 5 = 20
it 5n structure n = 4, tetrahedral

example: p4s3



electron count 4 × p + 3 × s = 4 × 5 + 3 × 6 = 38
it 5n + 3 structure n = 7. 3 vertices inserted edges

example: p4o6



electron count 4 × p + 6 × o = 4 × 5 + 6 × 6 = 56
it 5n + 6 structure n = 10. 6 vertices inserted edges






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