Thorium
Esquema
Jerarquía
<materials by composition> > inorganic material > metal > <metal by composition or origin> > nonferrous metal
Descripción
Pure metallic element having symbol TH and atomic number 90; a radioactive, soft, silvery metal most often extracted from the phosphate mineral, monazite. Use also for this metal as processed and formed, usually in combination with other substances, to make various objects and materials.
URI original del concepto
Otros términos
- TH [en]