Gemeg y elfen ei bennu gan y modd y mae'n cyflawni ei electronau yn cael eu trefnu yn y atom. Trefniadau i'r o'r fath ar sail y dosbarthiad modern cyfnodol yr elfennau: y Tabl Cyfnodol.
—from Structure and Bonding (Basic Concepts in Chemistry) (Strwythur a bondio (Cysyniadau Sylfaenol mewn Cemeg)), a book by Jack Barrett
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| Rank | Username | WPM | Accuracy | Date |
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| 1. | newB (dabbler) | 56.38 | — | 2009-12-06 |
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