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Lawrencium (Lr)
Atomic number: 103 · Category: actinide · Group 3 · Period 7 · Phase: Solid
Lawrencium 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.
Block: d
CPK color:#c70066
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 7p1
Configuration (semantic): [Rn] 5f14 7s2 7p1
Shells: 2, 8, 18, 32, 32, 8, 3
Electronegativity (Pauling): 1.3
Electron affinity: -30.04
Ionization energies: 470
Periodic position
Group: 3
Period: 7
xpos: 17
ypos: 10
Spectral/Bohr images
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3D Model