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Grolier Multimedia Encyclopedia 1995
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1994-08-24
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OCR:
Atomic number: 79 Atomic weight: 196.967 Usual valences: + 1 and + 3 Electronegativity: 1.72 ( Pauling scale) Melting point: 1063º C Boiling point: 2966º C Specific gravity (20º C): 19.3 g/cu cm Natural isotopes: 197 Specific heat (20º C): 0.0306 cal/g Electrical resistivity (20º C): 2.44 microhm-cm Hardness: 2.5-3.0 mohs (soft) Tensile strength: approx. 19,000 psi
