Stable isotope Lawrencium (Lr)

Isotope Atomic Mass Half-life Mode of Decay Nuclear Spin Nuclear Magnetic Moment
Lr-255 255.0967 22 seconds α to Md-251; EC to No-255 No data available No data available
Lr-256 256.0988 28 seconds α to Md-252; EC to No-256; SF No data available No data available
Lr-257 257.0996 0.65 seconds α to Md-253; SF 7/2 No data available
Lr-258 258.1019 3.90 seconds α to Md-254; EC to No-258; SF No data available No data available
Lr-259 259.1030 6.10 seconds α to Md-255; EC to No-259; SF No data available No data available
Lr-260 260.105320 3 minutes α to Md-256; EC to No-260; SF No data available No data available
Lr-261 261.1069 40 minutes SF No data available No data available
Lr-262 262.1097 3.60 hours EC to No-262; SF No data available No data available

Properties of Lawrencium

Name Lawrencium
Symbol Lr
Atomic number 103
Atomic weight [262]
Standard state Presumably a solid at 298 °K
CAS Registry ID 22537-19-5
Group in periodic table 3
Group name None
Period in periodic table 7
Block in periodic table d-block
Color Unknown, but probably metallic and silvery white or grey in appearance
Classification Metallic
Melting point About 1900 °K [or 1627 °C or 2961 °F] (predicted)
Boiling point No data available
Electron configuration [Rn]7s25f147p1