Metaloid
Term mewn cemeg ydy Metaloid, neu rhanfetel, wrth ddosbarthu elfennau cemegol.
| 13 | 14 | 15 | 16 | 17 | |
|---|---|---|---|---|---|
| 2 | B Boron | C Carbon | N Nitrogen | O Ocsigen | F Fflworin |
| 3 | Al Alwminiwm | Si Silicon | P Ffosfforws | S Swlffwr | Cl Clorin |
| 4 | Ga Galiwm | Ge Germaniwm | As Arsenig | Se Seleniwm | Br Bromin |
| 5 | In Indiwm | Sn Tun | Sb Antimoni | Te Telwriwm | I Iodin |
| 6 | Tl Thaliwm | Pb Plwm | Bi Bismwth | Po Poloniwm | At Astatin |
Gellir dosbarthu bron pob elfen o'r tabl cyfnodol i ddau ddosbarth: metalau ac anfetalau. Ond ceir rhai eithriadau prin a elwir yn fetaloidau. Daw'r gair hwn o'r iaith Roeg: metallon sy'n golygu "metel" ac eidos sy'n golygu "dosbarthiad".
Aelodau'r grŵp
Cyfeiriadau
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