Periodic table

 

 

Atomic number:92

Group numbers:3

Period:7

Electronic configuration:[Rn] 5f³ 6d¹ 7s²

Formal oxidation number:+3 +4 +5 +6

Electronegativities:1.7

Atomic radius / pm:138.5

Relative atomic mass:238.02891 ± 0.00003

 

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.

PHYSICAL PROPERTIES

Density / g dm^-3:18950 (293 K)

 17907 (m.p.)

Molar volume / cm³mol^-1:12.56 (293 K)

 13.29 (m.p.)

Electrical resistivity / μΩcm:30 (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m^-1K^-1:27.6

Melting point / °C:1135

Boiling point / °C:4131

Heat of fusion / kJ mol^-1:15.5

Heat of vaporization / kJ mol^-1:417.1

Heat of atomization / kJ mol^-1:535.43

IONIZATION ENERGIES

First ionization energy / kJ mol^-1:597.64

Second ionization energy / kJ mol^-1:-

Third ionization energy / kJ mol^-1:-

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:0.91

in the oceans / ppm:0.003

CRYSTALLOGRAPHIC DATA

ISOTOPES

REDUCTION POTENTIALS

 

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Citing this page:

Generalic, Eni. "Uranium." EniG. Periodic Table of the Elements. 16 May 2013. KTF-Split. {Date of access}. <http://www.periodni.com/u.html>.