-- card: 24637 from stack: in
-- bmap block id: 0
-- flags: 0000
-- background id: 14320
-- name: Tb


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Tb 

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Terbium

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65

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158.9254

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8.230

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1356

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3230

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+3,+4

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(named after Ytterby, a village in Sweden) Discovered by Mosander in1843. Found in cerite, gadolinite and monazite. Isolated only recently. 

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silvery-gray, rare earth metal, malleable, ductile, soft, can be cut with a knife, fairly stable in air, 19 isotopes

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used as a laser material, used in doping (adding impurities to semiconductors)  of solid state devices, potential use in color TV tubes as an phosphor activator

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0.161

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Electron Configuration:

1s  2s  2p  3s  3p  3d  4s  4p  4d  4f  5s  5p  5d  5f  6s  6p  6d  6f  7s 
 2   2    6    2    6   10   2   6  10   9   2    6              2