Terbium was discovered in 1843 by Carl Mosander. Its name derives from word "Ytterby" which is the name of a town in Sweden.
Terbium's melting point is at 1360.0 C (1633.15 K, 2480.0 F) and its boiling point is at 3041.0 C (3314.15 K, 5505.8 F).
Terbium is silvery-white rare-earth metal.
Terbium is malleable and ductile.
Terbium is part of many minerals. It is never found free in nature.
Only one stable isotope of terbium is known, terbium-159.
Terbium also has 36 radioisotopes and 27 nuclear isomers.
Almost all of terbium's production is used in green phosphors for fluorescent lamps in trichromatic lightning technology (together with europium blue phosphorus and europium red phosphorus) and color TV tubes.
Terbium is used in calcium fluoride and calcium tungstate in solid-state devices, as a stabilizer of fuel cells, in alloys and electronic devices, in naval sonar, in sensors, etc.
Terbium has no known biological role and it is considered of low toxicity.