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terbium (Info)
terbium:- a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite (Princeton WordNet 3.1)
terbium:- عنصر فلزي من العناصر الأرضية النادرة عدده الذري 65 ووزنه الذري 158,924 وينصهر عند 1356م 3 يوجد في التربة هيئة بعض مركباته(اكتشفه "موساندر" c Mosander عام 1843) رمزه(تب) (Tb) (معجم الكيمياء والصيدلة (ج٢))
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