Uranium (U)

Properties

Abundance
CAS Number	7440-61-1
PubChem CID	23989
Atomic Radius	156
Atomic Volume	12.59
Atomic Weight	238.029
Block	f
Boiling Point	4,131
Bulk Modulus
Category	Actinides
Crystal Structure	Base Centered Orthorhombic
Color	Silver
Covalent Radius	196
Density	18.95
Electrical Resistivity
Electron Configuration	[Rn] 5f³ 6d¹ 7s²
Electrons per shell	2, 8, 18, 32, 21, 9, 2
Electronegativity	1.38
Electrons	92
Group	na
Heat of Fusion	14
Heat of Vaporization	420
Ionization Potential	6.194
Magnetic Ordering
Magnetic Susceptibility
Mass	238.029
Mass Number	92
Melting Point	1,132.2
Name	Uranium
Neutrons	146
Atomic Number	238
Oxidation States	3, 4, 5, 6
Period	7
Phase	Solid
Poisson Ratio
Protons	92
Shear Modulus
Specific Heat Capacity	0.116
Symbol	U
Thermal Conductivity	0.276
Van der Waals radius
Young's Modulus
Abundance in Earth's crust	0.00018%
Abundance in Universe	2×10^-8%

U Uranium 92 238.02891 7 f 92 1132.0 3818.0 [Rn] 5f3 6d1 7s2 2 8 18 32 21 9 2 19.0 0.00018% Silver Orthorhombic 1.4 {"1":"597.6","2":"1420"} 598 +6,3,4,5 1.38 12.5 15.48 422.58 0.12 27.6 1 4.471×10⁹⁹y AlphaEmission Solid, Conductor, Actinide, Radioactive, Natural yoo-RAY-ni-em Silvery-white, dense, ductile, malleable, radioactive metal. For many centuries it was used as a pigment for glass. Now it is used as a fuel in nuclear reactors and in bombs. Occurs in many rocks, but in large amounts only in such minerals as pitchblende and carnotite. B8vVZTvJNGk Uranium

Osmium was discovered in 1803 by English chemist Smithson Tennant in London.

Chemists who studied platinum dissolved it in aqua regia to create soluble salts and observed a small amount of a dark, insoluble residue.

Smithson Tennant analyzed the insoluble residue and concluded that it must contain a new metal. From the Greek word osme, meaning smell 92 1789 Martin Klaproth Germany Named after the planet "Uranus"

Isotopes of Osmium

Standard Atomic Weight

238.02891(3)

Stable Isotopes

²³⁴U ²³⁵U ²³⁸U

Unstable Isotopes

²¹⁷U ²¹⁸U ²¹⁹U ²²⁰U ²²¹U ²²²U ²²³U ²²⁴U ²²⁵U ²²⁶U ²²⁷U ²²⁸U ²²⁹U ²³⁰U ²³¹U ²³²U ²³³U ²³⁶U ²³⁷U ²³⁹U ²⁴⁰U ²⁴¹U ²⁴²U

Even low concentrations in air can cause lung congestion, skin damage, or eye damage

Osmium is the least abundant stable element in the Earth's crust

Osmium is used alloyed with other metals in the platinum group to produce very hard alloys.

Osmium alloys are used in the tips of fountain pens, instrument pivots, and electrical contacts

Osmium tetroxide has been used in fingerprint detection and in staining fatty tissue for optical and electron microscopy.

Uranium on ChemicalAid