-- card: 32046 from stack: in
-- bmap block id: 0
-- flags: 0000
-- background id: 14320
-- name: Tm


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Tm

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Thulium

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69

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168.934

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9.31

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1545

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1950

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+2,+3

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(Thule, first name for Scandanavia) Discovered in 1879 by Cleve. Found in minerals such as monazite. About as rare as gold, silver and cadmium. 

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rare earth metal, silvery luster, silver gray, soft, malleable, ductile, can be cut with a knife, 16 isotopes (161-176), natural isotope 169 is stable, low to moderately toxic

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possible use as an energy source and in materials used in microwave equipment, high price makes it impractical

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0.158

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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  13   2    6              2