LAWRENCIUM, Lr (103)

Lawrencium is a radioactive metal with 12 isotopes, the most stable is 266Lr with a half-life of 11 hours, but the shorter-lived 260 Lr with its half-life 2.7 minutes, is most commonly used in chemistry as it can be produced on a larger scale.

ELEMENT BRIEF

1961 by Albert Ghiorso, Torbjorn Sikkeland, Almon Larsh and Robert M. Latimer, USA.

DISCOVERY

From the name of Ernest O. Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements.

ETYMOLOGY

Lawrencium

ELEMENT

Lr

SYMBOL

103

ATOMIC NUMBER

22537-19-5

CAS NUMBER

ELEMENTAL SPECTRUM

Silver

ELEMENTAL COLOUR

-

REFRACTIVE INDEX

-

POISSON RATIO

16.802 cm³

MOLAR VOLUME

-

BRINELL HARDNESS

-

MOHS HARDNESS

-

VICKERS HARDNESS

-

SPEED OF SOUND

-

BULK MODULUS

-

SHEAR MODULUS

-

YOUNG MODULUS

ALLOTROPES

NONE

1,900.15 K, 1,627.00 °C

MELTING POINT

-

BOILING POINT

-

AUTOMATIC IGNITION

-

FLASHPOINT

-

CRITICAL TEMPERATURE

-

CRITICAL PRESSURE

-

THERMAL CONDUCTIVITY

-

THERMAL EXPANSION

-

SPECIFIC HEAT

-

HEAT FUSION

-

HEAT VAPORISATION

-

HEAT COMBUSTION

-

CURIE POINT

-

NEEL POINT

-

ADIABATIC INDEX

Solid

PHASE

-

ELECTRICAL TYPE

-

CONDUCTIVITY

-

RESISTIVITY

-

SUPERCONDUCTING POINT

-

MAGNETIC TYPE

-

MASS SUSCEPTIBILITY

-

MOLAR SUSCEPTIBILITY

-

VOLUME SUSCEPTIBILITY

Actinide

CLASSIFICATION

262.109'610'0

ATOMIC WEIGHT

-

ATOMIC RADIUS

161 pm

COVALENT RADIUS SINGLE BOND

141 pm

COVALENT RADIUS DOUBLE BOND

-

COVALENT RADIUS TRIPLE BOND

246 pm

VAN DER WAALS RADIUS

[Rn]7s²5f¹⁴7p¹

ELECTRON CONFIGURATION

Hexagonal, Close Packed Single

CRYSTAL STRUCTURE

15.600'00 g/cm³

DENSITY AS SOLID

-

DENSITY AS LIQUID

-

DENSITY AS GAS

-

SPACE GROUP NAME

-

SPACE GROUP NUMBER

-

LATTICE ANGLES

-

LATTICE CONSTANTS

3

VALENCE

1.3

ELECTRONEGATIVITY

-

ELECTRON AFFINITY

IONISATION ENERGY