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Lawrencium (Lr)

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.

Lawrencium in the periodic table

SymbolLr
Atomic number103
Group0
Period7
Blockf
Element categoryActinide

Physical properties

Phase at STPSolid
Density g/cm3
Atomic weight266 u
Melting point1900 K
1626.85 °C
2960.33 °F
Boiling point K
°C
°F

Atomic properties

Electronegativity (Pauling Scale)1.3
Electron affinity-30.04 kJ/mol
Oxidation states+3
()
Ionization energies
1470 kJ/mol
21428 kJ/mol
32228 kJ/mol
44910 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f14 7s2 7p1
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2 7p1
Electrons per shell2, 8, 18, 32, 32, 8, 3

History

Discovered1961
Discovered byLawrence Berkeley National Laboratory
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