Uranium (U)

Uranium is a chemical element of the periodic table with chemical symbol U and atomic number 92 with an atomic weight of 238.029 u and is classed as actinide. Uranium is solid at room temperature.

Protactinium Periodic table Neptunium

Uranium in the periodic table

Symbol	U
Atomic number	92
Group	-
Period	7
Block	f
Classification	Actinide

Appearance	-
Color	Silver

Number of protons	92 p⁺
Number of neutrons	146 n⁰
Number of electrons	92 e^-

From Wikipedia, the free encyclopediaUranium is a chemical element with symbol U and atomic number 92. It is a silvery-white metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.

Physical properties

Phase at STP	Solid
Density	19.1 g/cm³
Atomic weight	238.029 u

Thermal properties

Melting point	1405.3 K 1132.15 °C 2069.87 °F
Boiling point	4404 K 4130.85 °C 7467.53 °F
Heat of vaporization	422.58 kJ/mol

Atomic properties

Electronegativity (Pauling Scale)	1.38
Electron affinity	50.94 kJ/mol
Oxidation states	+1, +2, +3, +4, +5, +6 (an amphoteric oxide)
Ionization energies	597.6 kJ/mol 1420 kJ/mol 1900 kJ/mol 3145 kJ/mol

Electron configuration for uranium

Electron configuration

Shorthand configuration

[Rn] 5f³ 6d¹ 7s²

Electron configuration

Full configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f³ 6s² 6p⁶ 6d¹ 7s²

Electron configuration chart

1s²
2s²	2p⁶
3s²	3p⁶	3d¹⁰
4s²	4p⁶	4d¹⁰	4f¹⁴
5s²	5p⁶	5d¹⁰	5f³
6s²	6p⁶	6d¹
7s²

Electrons per shell

2, 8, 18, 32, 21, 9, 2

Valence electrons

2

Valency electrons

6

Bohr model

Figure: Shell diagram of Uranium (U) atom.

Orbital Diagram

1s

2s

2p

3s

3p

3d

4s

4p

4d

4f

5s

5p

5d

5f

6s

6p

6d

7s

The history of Uranium

Discovery	Martin Heinrich Klaproth (1789)
First isolation	Eugène-Melchior Péligot (1841)

Periodic table history

Identifiers

List of unique identifiers for Uranium in various chemical registry databases

CAS Number	7440-61-1
ChemSpider ID	22425
EC number	231-170-6
PubChem CID Number	23989