Symbol	Lr
Atomic number	103
Group	-
Period	7
Block	f
Classification	Actinide

Appearance	-
Color	-

Number of protons	103 p+
Number of neutrons	159 n0
Number of electrons	103 e-

From Wikipedia, the free encyclopediaLawrencium is a synthetic chemical element with chemical symbol Lr (formerly Lw) and atomic number 103. It is named in honor of Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements. A radioactive metal, lawrencium is the eleventh transuranic element and is also the final member of the actinide series.

Phase at STP	Solid
Density	g/cm3
Atomic weight	262 u

Melting point	1900 K 1626.85 °C 2960.33 °F
Boiling point	-
Heat of vaporization	-

Electronegativity (Pauling Scale)	1.3
Electron affinity	-30.04 kJ/mol
Oxidation states	+3 ()
Ionization energies	470 kJ/mol 1428 kJ/mol 2228 kJ/mol 4910 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f14 7s2 7p1
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2 7p1
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2 7p1
Electrons per shell	2, 8, 18, 32, 32, 8, 3
Valence electrons	3
Valency electrons	3
Bohr model	Figure: Shell diagram of Lawrencium (Lr) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 7p

Discovery

Lawrence Berkeley National Laboratory, Joint Institute for Nuclear Research (1961)

CAS Number	22537-19-5
ChemSpider ID	28934
EC number	-
PubChem CID Number	31192