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User:Imaninjapirate/sandbox - Wikipedia, the free encyclopedia

User:Imaninjapirate/sandbox

From Wikipedia, the free encyclopedia

This page is about the chemical element. For other uses, see Imaninjapirate/sandbox (disambiguation).

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-

92 protactinium ← uranium → neptunium
Nd
↑
U
↓
(Uqb)
General
Name, Symbol, Number uranium, U, 92

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 Chemical series actinides

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 Group, Period, Block n/a, 7, f

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 Appearance silvery gray metallic;
corrodes to a spalling
black oxide coat in air

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 Standard atomic weight 238.02891(3)  g·mol−1

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 Electron configuration [Rn] 5f3 6d1 7s2

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 Electrons per shell 2, 8, 18, 32, 21, 9, 2

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 Physical properties

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 Phase solid

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 Density (near r.t.) 19.1  g·cm−3

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 Liquid density at m.p. 17.3  g·cm−3

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 Melting point 1405.3 K
(1132.2 °C, 2070 °F)

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 Boiling point 4404 K
(4131 °C, 7468 °F)

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 Heat of fusion 9.14  kJ·mol−1

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 Heat of vaporization 417.1  kJ·mol−1

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 Specific heat capacity (25 °C) 27.665  J·mol−1·K−1

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Vapor pressure
P(Pa) 1 10 100 1 k 10 k 100 k
at T(K) 2325 2564 2859 3234 3727 4402

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 Atomic properties

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 Crystal structure orthorhombic

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 Oxidation states 3+,4+,5+,6+[1]
(weakly basic oxide)

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 Electronegativity 1.38 (Pauling scale)

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 Ionization energies 1st: 597.6 kJ/mol
2nd: 1420 kJ/mol

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 Atomic radius 175  pm

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 Van der Waals radius 186 pm

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 Miscellaneous

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 Magnetic ordering paramagnetic

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 Electrical resistivity (0 °C) 0.280 µΩ·m

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 Thermal conductivity (300 K) 27.5  W·m−1·K−1

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 Thermal expansion (25 °C) 13.9  µm·m−1·K−1

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 Speed of sound (thin rod) (20 °C) 3155 m/s

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 Young's modulus 208  GPa

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 Shear modulus 111  GPa

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 Bulk modulus 100  GPa

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 Poisson ratio 0.23

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 CAS registry number 7440-61-1

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 Selected isotopes
Main article: Isotopes of imaninjapirate/sandbox
iso NA half-life DM DE (MeV) DP

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 232U

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 syn 68.9 y

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 α & SF 5.414 228Th

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 233U

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 syn 159,200 y

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 SF & α 4.909 229Th

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 234U

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 0.0058% 245,500 y

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 SF & α 4.859 230Th

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 235U

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 0.72% 7.038×108 y

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 SF & α 4.679 231Th

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 236U

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 syn 2.342×107 y

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 SF & α 4.572 232Th

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 238U

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 99.275% 4.468×109 y

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 SF & α 4.270 234Th

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 References


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