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zirconium

(Encyclopedia)zirconium z?rk?n??m [key], metallic chemical element; symbol Zr; at. no. 40; at. wt. 91.224; m.p. about 1,852C; b.p. 4,377C; sp. gr. 6.5 at 20C; valence +2, +3, or +4. Zirconium is a very ...

Zr

(Encyclopedia)Zr, symbol for the element zirconium.

Klaproth, Martin Heinrich

(Encyclopedia)Klaproth, Martin Heinrich mrt?n h?nr?kh klpr?t [key], 1743?1817, German chemist. He is often referred to as the father of analytic chemistry. He recognized (1789) the presence of zirco...

magnalium

(Encyclopedia)magnalium m?gn?l??m [key], alloy of aluminum and about 5% magnesium. Although weak and soft in the elemental state, magnesium alloys with aluminum, manganese, zinc, tin, zirconium, and cerium to...

hafnium

(Encyclopedia)hafnium h?fn??m [key], metallic chemical element; symbol Hf; at. no. 72; at. wt. 178.49; m.p. about 2,227C; b.p. 4,602C; sp. gr. 13.31 at 20C; valence +4. Hafnium is a lustrous, ductile, si...

Berzelius, Jns Jakob, Baron

(Encyclopedia)Berzelius, Jns Jakob, Baron b?rz?l??s; Swed. yns ykp b?rs?l??s [key], 1779?1848, Swedish chemist, M.D. Univ. of Uppsala, 1802. He was noted for his work as teacher at the medic...

silicate

(Encyclopedia)silicate, chemical compound containing silicon, oxygen, and one or more metals, e.g., aluminum, barium, beryllium, calcium, iron, magnesium, manganese, potassium, sodium, or zirconium. Silicates may b...

rare-earth metals

(Encyclopedia)rare-earth metals, in chemistry, group of metals including those of the lanthanide series and actinide series and usually yttrium, sometimes scandium and thorium, and rarely zirconium. Promethium, whi...

rutherfordium

(Encyclopedia)rutherfordium r????rfrd??m [key], artificially produced radioactive chemical element; symbol Rf; at. no. 104; mass number of most stable isotope 265; m.p., b.p., and sp. gr. unknown; valenc...

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