Uranium is a silvery-white metal with 6 valence electrons and is weakly radioactive due to unstable isotopes (half-lives of the 6 naturally known isotopes, uranium-233 to uranium-238, varying between 69 years and 4.5 billion years).

1789 by Martin Klaproth, Germany.

DISCOVERY

From the name Uranus, the planet.

ETYMOLOGY

Uranium

Element

U

Symbol

92

92 Atomic Number

Atomic Number

Actinide

Classification

7440-61-1

CAS Number

Silver

Elemental Colour

-

Refractive Index

0.230

0.230 Poisson Ratio

Poisson Ratio

12.495 cm³

Molar Volume

2.40G Pa, 23.686'2k Atm

23.686'2k Atm

Brinell Hardness

6.00

6.00 Mohs Hardness

Mohs Hardness

1.96G Pa, 19.343'7k Atm

19.343'7k Atm

Vickers Hardness

3,155 m/s, Mach 9.198'3

3,155 m/s

Speed of Sound

100.00G Pa, 986.923'3k Atm

986.923'3k Atm

Bulk Modulus

111.00G Pa, 1.095'5M Atm

1.095'5M Atm

Shear Modulus

208.00G Pa, 2.052'8M Atm

2.052'8M Atm

Young Modulus

Allotropes

1,408.15 K, 1,135.00 °C

1,135.00 °C

Melting Point

4,200.15 K, 3,927.00 °C

3,927.00 °C

Boiling Point

-

Automatic Ignition

-

Flashpoint

-

Critical Temperature

-

Critical Pressure

27.000'000 W/(m K)

Thermal Conductivity

0.000'013'9 K^-1

Thermal Expansion

116.00 J/(kg K)

Specific Heat

14.000 kJ/mol

Heat Fusion

420.000 kJ/mol

Heat Vaporisation

-

Heat Combustion

-

Curie Point

-

Neel Point

-

Adiabatic Index

Solid

Phase

Conductor

Electrical Type

3.60M S/m

Conductivity

280.00n Ω.m

Resistivity

0.680 K

Superconducting Point

-

Magnetic Type

0.000'000'021'5

Mass Susceptibility

0.000'000'005'118'00

Molar Susceptibility

0.000'409'600'00

Volume Susceptibility

Material Composition

0.000'000'02 %

Universe

0.000'000'8 %

Meteorites

0.000'000'1 %

Sun

0.000'18 %

Earth Crust

0.000'000'33 %

Oceans

0.000'000'5 %

Humans

238.028'910'5

Atomic Weight

139 pm

Atomic Radius

170 pm

Covalent Radius Single Bond

134 pm

Covalent Radius Double Bond

118 pm

Covalent Radius Triple Bond

240 pm

Van der Waals Radius

[Rn]7s²5f³6d¹

Electron Configuration

Orthorhombic, Primitive

Crystal Structure

19.050'00 g/cm³

Density as Solid

17.300'00 g/cm³

Density as Liquid

-

Density as Gas

Cmcm

Space Group Name

63

63 Space Group Number

Space Group Number

π/2, π/2 & π/2

Lattice Angles

285.37, 586.95 & 495.48 pm

Lattice Constants

4.47 x 10⁹ years

Half Life

6.45 x 10⁹ years

Lifetime

6d¹ = 6, 2, -2, +1/2

Quantum Numbers

8.908'00 b σ_s

Neutron Cross Section

7.570'00 b σ_a

Neutron Mass Absorption

Stable Isotopes

NONE

Unstable Isotopes

Isotopes Overview

Isotope	Stability	Symbol	Type	Protons		Neutrons		Spin	Parity	Mass		Abundance		Mass Measure	Mass Excess		Binding Energy		Dipole Moment		Quadrupole Moment		Halflife in Years		Halflife in Seconds		A01 Decay Probability		A01 Decay Mode	A01 Decay Energy		A01 Decay Daughter	A01 Decay Link	A02 Decay Mode	A02 Decay Energy		A02 Decay Daughter	A02 Decay Link	A03 Decay Probability		A03 Decay Mode	A03 Decay Energy		A03 Decay Daughter	A03 Decay Link	A04 Decay Probability		A04 Decay Mode	A04 Decay Energy		Y01 Decay Product Yield		Y01 Decay Product Nuclide	Y02 Decay Product Yield		Y02 Decay Product Nuclide	Y03 Decay Product Yield		Y03 Decay Product Nuclide	Y04 Decay Product Yield		Y04 Decay Product Nuclide	Y05 Decay Product Yield		Y05 Decay Product Nuclide	Y06 Decay Product Yield		Y06 Decay Product Nuclide	Y07 Decay Product Yield		Y07 Decay Product Nuclide	Y08 Decay Product Yield		Y08 Decay Product Nuclide	Y09 Decay Product Yield		Y09 Decay Product Nuclide	Y10 Decay Product Yield		Y10 Decay Product Nuclide	Y11 Decay Product Yield		Y11 Decay Product Nuclide	Y12 Decay Product Yield		Y12 Decay Product Nuclide
Isotope_092_u_217_u	Unstable	²¹⁷U	Fermion	92	p	125	n	1/2	-1	217.024'368'791'0	u	~ 0	%	~ 0	56.803'000'000'0	MeV	7.538'000'000'0	MeV	-		-		8.24E-10	year	26.000	milli-seconds ( x⁻³ )	?	%	α	8,155.600	keV	²¹³Th	²¹⁷U > [ ? % , α , 8,155.6 keV ] > ²¹³Th																		?	%	²⁰⁵Tl	?	%	²⁰¹Hg	?	%	¹⁹⁷Au
Isotope_092_u_218_u	Unstable	²¹⁸U	Boson	92	p	126	n	0	1	218.023'535'671'0	u	~ 0	%	~ 0	22.699'383'000'0	MeV	7.635'026'000'0	MeV	-		-		1.90E-10	year	6.000	milli-seconds ( x⁻³ )	100.000'000	%	α	8,786.500	keV	²¹⁴Th	²¹⁸U > [ 100 % , α , 8,786.5 keV ] > ²¹⁴Th																		60.912'859	%	²⁰²Hg	37.978'499	%	²⁰⁶Pb	1.751'918	%	¹⁹⁸Hg
Isotope_092_u_219_u	Unstable	²¹⁹U	Fermion	92	p	127	n	9/2	1	219.024'919'160'0	u	~ 0	%	~ 0	21.923'337'000'0	MeV	7.640'587'000'0	MeV	-		-		1.74E-12	year	55.000	micro-seconds ( x⁻⁶ )	100.000'000	%	α	8,960.400	keV	²¹⁵Th	²¹⁹U > [ 100 % , α , 8,960.4 keV ] > ²¹⁵Th	β+	9,860.400	keV	²¹⁹Pa	²¹⁹U > [ , β+ , 9,860.4 keV ] > ²¹⁹Pa													73.669'993	%	²⁰⁷Pb	26.345'278	%	²⁰³Tl	0.021'486	%	¹⁹⁹Hg
Isotope_092_u_220_u	Unstable	²²⁰U	Boson	92	p	128	n	0	1	220.024'723'000'0	u	~ 0	%	~ 0	23.212'048'000'0	MeV	7.636'669'000'0	MeV	-		-		1.90E-15	year	60.000	nano-seconds ( x⁻⁹ )	?	%	α	10,300.000	keV	²¹⁶Th	²²⁰U > [ ? % , α , 10,300.0 keV ] > ²¹⁶Th	β+	1,630.000	keV	²²⁰Pa	²²⁰U > [ , β+ , 1,630.0 keV ] > ²²⁰Pa													?	%	²⁰⁰Hg	?	%	²⁰⁸Pb
Isotope_092_u_221_u	Unstable	²²¹U	Fermion	92	p	129	n	9/2	1	221.026'399'000'0	u	~ 0	%	~ 0	23.029'000'000'0	MeV	7.639'000'000'0	MeV	-		-		2.22E-14	year	700.000	nano-seconds ( x⁻⁹ )	?	%	α	9,950.000	keV	²¹⁷Th	²²¹U > [ ? % , α , 9,950.0 keV ] > ²¹⁷Th	β+	3,190.000	keV	²²¹Pa	²²¹U > [ , β+ , 3,190.0 keV ] > ²²¹Pa													?	%	²⁰⁵Tl	?	%	²⁰¹Hg
Isotope_092_u_222_u	Unstable	²²²U	Boson	92	p	130	n	0	1	222.026'086'000'0	u	~ 0	%	~ 0	24.591'000'000'0	MeV	7.634'000'000'0	MeV	-		-		4.44E-14	year	1.400	micro-seconds ( x⁻⁶ )	100.000'000	%	α	9,500.000	keV	²¹⁸Th	²²²U > [ 100 % , α , 9,500.0 keV ] > ²¹⁸Th	β+	1,162.000	keV	²²²Pa	²²²U > [ , β+ , 1,162.0 keV ] > ²²²Pa													90.827'104	%	²⁰⁶Pb	5.232'000	%	²⁰²Hg	0.052'320	%	¹⁹⁸Hg
Isotope_092_u_223_u	Unstable	²²³U	Fermion	92	p	131	n	7/2	1	223.027'738'600'0	u	~ 0	%	~ 0	24.299'000'000'0	MeV	7.638'000'000'0	MeV	-		-		6.65E-13	year	21.000	micro-seconds ( x⁻⁶ )	100.000'000	%	α	8,940.900	keV	²¹⁹Th	²²³U > [ 100 % , α , 8,940.9 keV ] > ²¹⁹Th	β+	2,495.000	keV	²²³Pa	²²³U > [ , β+ , 2,495.0 keV ] > ²²³Pa													100.200'002	%	²⁰⁷Pb	0.005'754	%	²⁰³Tl
Isotope_092_u_224_u	Unstable	²²⁴U	Boson	92	p	132	n	0	1	224.027'604'778'0	u	~ 0	%	~ 0	25.838'340'000'0	MeV	7.632'688'000'0	MeV	-		-		2.98E-11	year	940.000	micro-seconds ( x⁻⁶ )	100.000'000	%	α	8,619.800	keV	²²⁰Th	²²⁴U > [ 100 % , α , 8,619.8 keV ] > ²²⁰Th	β+	821.300	keV	²²⁴Pa	²²⁴U > [ , β+ , 821.3 keV ] > ²²⁴Pa													0.002'350	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg
Isotope_092_u_225_u	Unstable	²²⁵U	Fermion	92	p	133	n	5/2	1	225.029'390'717'0	u	~ 0	%	~ 0	25.713'685'000'0	MeV	7.635'203'000'0	MeV	-		-		1.93E-9	year	61.000	milli-seconds ( x⁻³ )	100.000'000	%	α	8,014.380	keV	²²¹Th	²²⁵U > [ 100 % , α , 8,014.38 keV ] > ²²¹Th																		100.480'000	%	²⁰⁵Tl
Isotope_092_u_226_u	Unstable	²²⁶U	Boson	92	p	134	n	0	1	226.029'338'702'0	u	~ 0	%	~ 0	27.377'277'000'0	MeV	7.629'747'000'0	MeV	-		-		8.52E-9	year	269.000	milli-seconds ( x⁻³ )	100.000'000	%	α	7,700.970	keV	²²²Th	²²⁶U > [ 100 % , α , 7,700.97 keV ] > ²²²Th																		100.000'000	%	²⁰⁶Pb	0.000'000	%	²⁰⁸Pb
Isotope_092_u_227_u	Unstable	²²⁷U	Fermion	92	p	135	n	3/2	1	227.031'156'367'0	u	~ 0	%	~ 0	27.328'826'000'0	MeV	7.631'916'000'0	MeV	-		-		2.09E-6	year	66.000	seconds ( x⁰ )	100.000'000	%	α	7,211.300	keV	²²³Th	²²⁷U > [ 100 % , α , 7,211.3 keV ] > ²²³Th	β+	1,168.000	keV	²²⁷Pa	²²⁷U > [ , β+ , 1,168.0 keV ] > ²²⁷Pa													100.001'003	%	²⁰⁶Pb	0.000'000	%	²⁰⁵Tl
Isotope_092_u_228_u	Unstable	²²⁸U	Boson	92	p	136	n	0	1	228.031'374'006'0	u	~ 0	%	~ 0	29.021'970'000'0	MeV	7.626'393'000'0	MeV	-		-		1.74E-5	year	550.020	seconds ( x⁰ )	95.000'000	%	α	6,803.500	keV	²²⁴Th	²²⁸U > [ 95 % , α , 6,803.5 keV ] > ²²⁴Th	ϵ	300.500	keV	²²⁸Pa	²²⁸U > [ , ϵ , 300.5 keV ] > ²²⁸Pa													100.001'833	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb
Isotope_092_u_229_u	Unstable	²²⁹U	Fermion	92	p	137	n	3/2	1	229.033'505'939'0	u	~ 0	%	~ 0	29.224'699'000'0	MeV	7.627'455'000'0	MeV	-		-		1.11E-4	year	3.499	kilo-seconds ( x³ )	80.000'000	%	β+	290.410	keV	²²⁹Pa	²²⁹U > [ 80 % , β+ , 290.41 keV ] > ²²⁹Pa	α	6,475.430	keV	²²⁵Th	²²⁹U > [ , α , 6,475.43 keV ] > ²²⁵Th													100.394'545	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_092_u_230_u	Unstable	²³⁰U	Boson	92	p	138	n	0	1	230.033'939'784'0	u	~ 0	%	~ 0	31.210'582'000'0	MeV	7.620'721'000'0	MeV	-		-		5.69E-2	year	1.797	mega-seconds ( x⁶ )	100.000'000	%	α	5,992.730	keV	²²⁶Th	²³⁰U > [ 100 % , α , 5,992.73 keV ] > ²²⁶Th	SF	?	keV	V	²³⁰U > [ , SF , ? keV ] > V	0.000'000	%	²²Ne	?	keV	²⁰⁸Pb	²³⁰U > [ 0.0000000000048 % , ²²Ne , ? keV ] > ²⁰⁸Pb	?	%	2β+	-1,293.670	keV	100.000'134	%	²⁰⁶Pb	0.000'000	%	²⁰⁸Pb	?	%	²⁰⁵Tl
Isotope_092_u_231_u	Unstable	²³¹U	Fermion	92	p	139	n	5/2	1	231.036'293'704'0	u	~ 0	%	~ 0	31.614'706'000'0	MeV	7.620'923'000'0	MeV	-		-		1.14E-2	year	360.288	kilo-seconds ( x³ )	100.000'000	%	ϵ	381.650	keV	²³¹Pa	²³¹U > [ 100 % , ϵ , 381.65 keV ] > ²³¹Pa	α	5,576.280	keV	²²⁷Th	²³¹U > [ , α , 5,576.28 keV ] > ²²⁷Th													100.280'325	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Pb	0.000'000	%	²⁰⁸Pb
Isotope_092_u_232_u	Unstable	²³²U	Boson	92	p	140	n	0	1	232.037'156'152'0	u	~ 0	%	~ 0	33.807'368'000'0	MeV	7.613'381'000'0	MeV	-		-		6.88E+1	years	2.171	giga-seconds ( x⁹ )	100.000'000	%	α	5,413.630	keV	²²⁸Th	²³²U > [ 100 % , α , 5,413.63 keV ] > ²²⁸Th	²⁴Ne	?	keV	²⁰⁸Pb	²³²U > [ , ²⁴Ne , ? keV ] > ²⁰⁸Pb	0.000'000	%	²⁸Mg	?	keV	²⁰⁴Hg	²³²U > [ 0.000000000005 % , ²⁸Mg , ? keV ] > ²⁰⁴Hg	0.000'000	%	SF	?	keV	100.004'000	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg
Isotope_092_u_233_u	Unstable	²³³U	Fermion	92	p	141	n	5/2	1	233.039'635'207'0	u	~ 0	%	~ 0	34.610'734'000'0	MeV	7.611'892'000'0	MeV	0.590'000'000'0	nm	-		1.59E+5	years	5.027	tera-seconds ( x¹² )	100.000'000	%	α	4,908.530	keV	²²⁹Th	²³³U > [ 100 % , α , 4,908.53 keV ] > ²²⁹Th	SF	?	keV	V	²³³U > [ , SF , ? keV ] > V	0.000'000	%	²⁴Ne	?	keV	²⁰⁹Pb	²³³U > [ 0.000000000072 % , ²⁴Ne , ? keV ] > ²⁰⁹Pb	0.000'000	%	²⁸Mg	?	keV	100.012'800	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_092_u_234_u	Unstable	²³⁴U	Boson	92	p	142	n	0	1	234.040'952'088'0	u	0.005'500	%	0.012'872'252'4	36.919'958'000'0	MeV	7.603'953'000'0	MeV	-		3.366'300'000'0	b	2.46E+5	years	7.752	tera-seconds ( x¹² )	100.000'000	%	α	4,857.730	keV	²³⁰Th	²³⁴U > [ 100 % , α , 4,857.73 keV ] > ²³⁰Th	SF	?	keV	V	²³⁴U > [ , SF , ? keV ] > V	0.000'000	%	²⁸Mg	?	keV	²⁰⁶Hg	²³⁴U > [ 0.000000000014 % , ²⁸Mg , ? keV ] > ²⁰⁶Hg	0.000'000	%		?	keV	100.044'159	%	²⁰⁶Pb	0.000'002	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_092_u_235_u	Unstable	²³⁵U	Fermion	92	p	143	n	7/2	-1	235.043'929'918'0	u	0.720'000	%	1.692'316'295'4	38.146'625'000'0	MeV	7.600'708'000'0	MeV	-0.380'000'000'0	nm	-		7.04E+8	years	22.217	peta-seconds ( x¹⁵ )	100.000'000	%	α	4,678.260	keV	²³¹Th	²³⁵U > [ 100 % , α , 4,678.26 keV ] > ²³¹Th	SF	?	keV	V	²³⁵U > [ , SF , ? keV ] > V	0.000'000	%	²⁸Mg	?	keV	²⁰⁷Hg	²³⁵U > [ 0.0000000008 % , ²⁸Mg , ? keV ] > ²⁰⁷Hg	0.000'000	%	²⁵Ne	?	keV	100.276'314	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁶Pb	?	%	¹⁸⁰Hf
Isotope_092_u_236_u	Unstable	²³⁶U	Boson	92	p	144	n	0	1	236.045'568'006'0	u	~ 0	%	~ 0	40.920'456'000'0	MeV	7.590'907'000'0	MeV	-		4.550'000'000'0	b	2.34E+7	years	739.615	tera-seconds ( x¹² )	100.000'000	%	α	4,573.100	keV	²³²Th	²³⁶U > [ 100 % , α , 4,573.1 keV ] > ²³²Th	SF	?	keV	V	²³⁶U > [ , SF , ? keV ] > V													100.004'000	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg	0.000'000	%	²⁰⁸Pb
Isotope_092_u_237_u	Unstable	²³⁷U	Fermion	92	p	145	n	1/2	1	237.048'730'184'0	u	~ 0	%	~ 0	42.446'325'000'0	MeV	7.586'477'000'0	MeV	-		-		1.85E-2	year	583.027	kilo-seconds ( x³ )	100.000'000	%	β-	518.600	keV	²³⁷Np	²³⁷U > [ 100 % , β- , 518.6 keV ] > ²³⁷Np																		100.012'800	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_092_u_238_u	Unstable	²³⁸U	Boson	92	p	146	n	0	1	238.050'788'247'0	u	99.274'500	%	236.323'729'778'3	45.391'875'000'0	MeV	7.576'094'000'0	MeV	-		-		4.47E+9	years	141.094	peta-seconds ( x¹⁵ )	100.000'000	%	α	4,269.750	keV	²³⁴Th	²³⁸U > [ 100 % , α , 4,269.75 keV ] > ²³⁴Th	SF	?	keV	V	²³⁸U > [ , SF , ? keV ] > V	0.000'000	%	2β-	1,144.200	keV	²³⁸Pu	²³⁸U > [ 0.00000000022 % , 2β- , 1,144.2 keV ] > ²³⁸Pu						100.044'159	%	²⁰⁶Pb	0.000'002	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_092_u_239_u	Unstable	²³⁹U	Fermion	92	p	147	n	5/2	1	239.054'293'299'0	u	~ 0	%	~ 0	47.308'948'000'0	MeV	7.570'120'000'0	MeV	-		13.900'000'000'0	b	4.46E-5	year	1.407	kilo-seconds ( x³ )	100.000'000	%	β-	1,261.500	keV	²³⁹Np	²³⁹U > [ 100 % , β- , 1,261.5 keV ] > ²³⁹Np																		100.276'314	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁶Pb	0.000'000	%	¹⁶⁰Dy	0.000'000	%	¹⁴⁰Ce	?	%	¹⁷²Yb	?	%	¹⁷⁶Hf	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_092_u_240_u	Unstable	²⁴⁰U	Boson	92	p	148	n	0	1	240.056'591'988'0	u	~ 0	%	~ 0	50.573'883'000'0	MeV	7.558'557'000'0	MeV	-		-		1.61E-3	year	50.796	kilo-seconds ( x³ )	100.000'000	%	β-	400.400	keV	²⁴⁰Np	²⁴⁰U > [ 100 % , β- , 400.4 keV ] > ²⁴⁰Np	α	3,837.000	keV	²³⁶Th	²⁴⁰U > [ , α , 3,837.0 keV ] > ²³⁶Th													100.004'000	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg	0.000'000	%	²⁰⁸Pb
Isotope_092_u_241_u	Unstable	²⁴¹U	Fermion	92	p	149	n	7/2	1	241.060'330'000'0	u	~ 0	%	~ 0	52.715'098'000'0	MeV	7.551'771'000'0	MeV	-		-		1.58E-10	year	5.000	milli-seconds ( x⁻³ )	?	%	β-	1,935.000	keV	²⁴¹Np	²⁴¹U > [ ? % , β- , 1,935.0 keV ] > ²⁴¹Np																		?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_092_u_242_u	Unstable	²⁴²U	Boson	92	p	150	n	0	1	242.062'931'000'0	u	~ 0	%	~ 0	56.197'000'000'0	MeV	7.539'000'000'0	MeV	-		-		3.20E-5	year	1.010	kilo-seconds ( x³ )	100.000'000	%	β-	1,202.000	keV	²⁴²Np	²⁴²U > [ 100 % , β- , 1,202.0 keV ] > ²⁴²Np																		100.044'159	%	²⁰⁶Pb	0.000'002	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb

92 – Uranium, U

92 – Uranium, U

92 – Uranium, U

92 – Uranium, U

92 – Uranium, U

Spectrograph

Elemental Tile

Uranium from Uranopilite

Spectrograph

Elemental Tile

Uranium from Uranopilite

Spectrograph

Elemental Tile

Uranium from Uranopilite

Spectrograph

Elemental Tile

Uranium from Uranopilite

Spectrograph

Elemental Tile

Uranium from Uranopilite