Defnyddiwr:Myrddin1977
From Wikipedia, the free encyclopedia
Erthyglau sydd wedi eu 'cwblhau':
- Halogen
- elfen cemegol
- alotrop
- metel
- isotop
- anfetel
- tabl cyfnodol
- Rhestr elfennau yn nhrefn eu darganfyddiad
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| Chwiliwch ieithoedd defnyddwyr |
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