PresentKnot

Tuesday, November 16, 2004

Terbium

(Tb), chemical element, rare-earth metal of transition Group IIIb of the periodic table. One of the least abundant of the rare earths, terbium, when reduced to metallic form, is silvery white and is slowly oxidized by air at room temperatures and by cold water. The element was discovered in 1843 by Carl Gustaf Mosander in a heavy rare-earth fraction called yttria, but its existence

0 Comments:

Post a Comment

<< Home