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Metaloid

Oddi ar Wicipedia
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

Elfen gemegol ydy metelffurf[1] (hefyd metalffurf, lled-fetel[2] a gofetel[3]) sydd â phriodweddau metelig ac anfetelig, fel arsenig, silicon neu boron. Gellir dosbarthu bron pob elfen o'r tabl cyfnodol i ddau ddosbarth: metalau ac anfetalau. Ond ceir rhai eithriadau prin a elwir yn fetelffurfiau neu'n led-fetelau. Daw'r gair hwn o'r Hen Roeg metallon ‘metel’ ac eidos ‘siâp, ffurf’.[4]

Aelodau'r grŵp

[golygu | golygu cod]
  1. Boron (B)
  2. Silicon (Si)
  3. Germaniwm (Ge)
  4. Arsenig (As)
  5. Antimoni (Sb)
  6. Telwriwm (Te)
  7. Poloniwm (Po)

Cyfeiriadau

[golygu | golygu cod]
  1. ↑ Geiriadur yr Academi, d.g. ‘metalloid’.
  2. ↑ Geiriadur yr Academi, d.g. ‘semi-metal’.
  3. ↑ GPC, d.g. ‘metalloid’, ‘gofetel’.
  4. ↑ Sherman a G.J. Weston, Chemistry of the non-metallic elements (Efrog Newydd: Pergamon Press, 1966), tud. 64
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