Elements
92

U

Uranium

Uranium (U) is a silvery-white colored radioactive metal that has the atomic number 92 in the periodic table. It is an Actinoid Metal with the symbol U.

Uranium was discovered in 1789 by Martin Heinrich Klaproth. He was studying the mineral pitchblende and upon mixing with nitric acid and potash discovered a yellow precipitate. He named it Uranium, after the planet Uranus. It was not until 1841 that Eugene-Melchior Peligot isolated uranium metal. Uranium oxides have been used for many years as pigments due to their intense yellow colour. Uranium is a highly reactive and radioactive metal and is very popular in thermonuclear reactors due to its ability to undergo nuclear decay and release heat energy. It is also used in nuclear weapons. Uranium occurs in the earths crust as an ore and is not free elementally. Whilst uranium is dangerous it emits alpha particles which cannot penetrate skin, however it is still highly toxic and easily ignites as a powder. It is a solid metal at room temperature and it has a melting point of 1132°c and a boiling point of 4131°c.

Download Uranium as a printable and fully scalable image

Get the free download here (JPEG, PDF, SVG)

FAQ's

What is the Melting Point for Uranium?

Uranium has a Melting Point of 1132°F, meaning at 1132°F it will turn to a liquid.

What is the Boiling Point for Uranium?

Uranium has a Boiling Point of 3818°F, meaning at 3818°F it will turn to a Gas.

What is the Electronegativity of Uranium?

Uranium's Electronegativty is 1.38. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Uranium?

Uranium has a Heat of Vaporization of 477 kJ/mol.

Uses

For many centuries it was used as a pigment for glass. Now it is used as a fuel in nuclear reactors and in bombs.

Sources

Occurs in many rocks, but in large amounts only in such minerals as pitchblende and carnotite.

92
Protons
92
Electrons
146
Neutrons

U

Element Symbol
U
Atomic Weight
238.029
Atomic Number
92
State
Solid
Melting Point
Unknown
1132
°C
Boiling Point
3818
Unknown
°C
Heat of Vaporization
477
Unknown
kJ/mol
Crystal Structure
Orthorhombic
Thermoconductivity
0.276
Unknown
W/cmK
Shells
2,8,18,32,21,9,2
Group
Actinide
Period
7
Block
F Block
Orbitals
[Rn] 5f3 6d1 7s2
Coefficient of Thermal Expansion
13.9 10^-6 K^-1
Covalent Radius
1.42 Å
Density at 293K
18.9 g/cm³
Electrical Conductivity
0.0380 10^6/cm ohm
First Ionization Potential
6.1941 V
Second Ionization Potential
--
Third Ionization Potential
--
Ionic Radius
.81 (+6) Å
Oxydation States
(6),5,4,3
Lattice Parameter
2.8538 Å
Lattice Parameter 2
--
Lattice Parameter 3
11.240 Å
Pronounced

yoo-RAY-ni-em

Discovered by

Martin Klaproth

Discovery date

1789

Orbital configuration
2,8,18,32,21,9,2

Download the Periodic Table

Explore Other Actinides

252
99

Es

Einsteinium
262
103

Lr

Lawrencium
247
96

Cm

Curium
237
93

Np

Neptunium
243
95

Am

Americium
259
102

No

Nobelium
231.036
91

Pa

Protactinium
247
97

Bk

Berkelium
258
101

Md

Mendelevium
244
94

Pu

Plutonium
251
98

Cf

Californium
232.038
90

Th

Thorium
227
89

Ac

Actinium
257
100

Fm

Fermium
The actinide series contains 15 metallic elements from number 89 (actinium) to 103 (lawrencium). They are located in group 3 in the periodic table.
Previous

Protactinium

91
Next

Neptunium

93