Relative atomic mass: 238.02891 +- 0.00003

English: Uranium
French: Uranium
Croatian: Uranij
German: Uran
Italian: Uranio
Spanish: Uranio

Atomic number: 92
Group numbers: 3
Period: 7
Standard state (20 oC): solid

Discovery: 1789 Martin Heinrich Klaproth (DE)
Uranium was discovered by Martin Heinrich Klaproth (DE) in 1789. Named after the planet Uranus. It is a silvery-white, dense, ductile, malleable, radioactive, radiotoxic metal that resists alkalis, tarnishes in air and reacts with steam and acids. Uranium occurs in many rocks, but in large amounts only in such minerals as pitchblende and carnotite. For many centuries it was used as a pigment for glass. Now it is used as a fuel in nuclear reactors and in bombs. The price of 99.7 % pure uranium turnings is 217.60 for 25 g.
Electronic configuration: [Rn] 5f3 6d1 7s2
Formal oxidation number: +3 +4 +5 +6
Atomic radius: 138.5 pm

Electronegativities: 1.7
Thermal conductivity: 27.6 W/(m K)
Electrical resistivity (20 oC): 30 microOhm cm

Melting point: 1135 oC
Boiling point: 4131 oC

Heat of fusion: 15.5 kJ/mol
Heat of vaporization: 417.1 kJ/mol
Heat of atomization: 535.43 kJ/mol

91Pa <= 92U => 93Np

ASCII Periodic Table of the Elements
6 Jan. 2020
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