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

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

103 Atomic Number

Atomic Number

Actinide

Classification

22537-19-5

CAS Number

-

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

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

Material Composition

-

Universe

-

Meteorites

-

Sun

-

Earth Crust

-

Oceans

-

Humans

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

10.00 hours

Half Life

14.44 hours

Lifetime

7p¹ = 7, 1, -1, +1/2

Quantum Numbers

-

Neutron Cross Section

-

Neutron Mass Absorption

Stable Isotopes

NONE

Unstable Isotopes

Isotopes Overview

Isotope	Stability	Symbol	Type	Protons		Neutrons		Spin	Parity	Mass		Abundance		Mass Measure	Mass Excess		Binding Energy		Dipole Moment	Quadrupole Moment	Halflife in Years		Halflife in Seconds		A01 Decay Probability		A01 Decay Mode	A01 Decay Energy		A01 Decay Daughter	A01 Decay Link	A02 Decay Mode	A02 Decay Energy		A02 Decay Daughter	A02 Decay Link	A03 Decay Probability		A03 Decay Mode	A03 Decay Energy		A03 Decay Daughter	A03 Decay Link	Y01 Decay Product Yield		Y01 Decay Product Nuclide	Y02 Decay Product Yield		Y02 Decay Product Nuclide	Y03 Decay Product Yield		Y03 Decay Product Nuclide	Y04 Decay Product Yield		Y04 Decay Product Nuclide	Y05 Decay Product Yield		Y05 Decay Product Nuclide	Y06 Decay Product Yield		Y06 Decay Product Nuclide	Y07 Decay Product Yield		Y07 Decay Product Nuclide	Y08 Decay Product Yield		Y08 Decay Product Nuclide	Y09 Decay Product Yield		Y09 Decay Product Nuclide	Y10 Decay Product Yield		Y10 Decay Product Nuclide	Y11 Decay Product Yield		Y11 Decay Product Nuclide	Y12 Decay Product Yield		Y12 Decay Product Nuclide
Isotope_103_lr_251_u	Unstable	²⁵¹Lr	Boson	103	p	148	n	?	0	251.094'360'000'0	u	~ 0	%	~ 0	104.649'000'000'0	MeV	7.373'000'000'0	MeV	-	-	4.75E-12	year	150.000	micro-seconds ( x⁻⁶ )	?	%	β+	3,960.000	keV	²⁵¹No	²⁵¹Lr > [ ? % , β+ , 3,960.0 keV ] > ²⁵¹No	α	9,428.000	keV	²⁴⁷Md	²⁵¹Lr > [ , α , 9,428.0 keV ] > ²⁴⁷Md								?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb
Isotope_103_lr_252_u	Unstable	²⁵²Lr	Fermion	103	p	149	n	?	0	252.095'371'000'0	u	~ 0	%	~ 0	87.896'000'000'0	MeV	7.400'000'000'0	MeV	-	-	1.24E-8	year	390.000	milli-seconds ( x⁻³ )	71.000'000	%	β+	4,934.000	keV	²⁵²No	²⁵²Lr > [ 71 % , β+ , 4,934.0 keV ] > ²⁵²No	α	9,264.000	keV	²⁴⁸Md	²⁵²Lr > [ , α , 9,264.0 keV ] > ²⁴⁸Md	1.000'000	%	SF	?	keV	V	²⁵²Lr > [ 1 % , SF , ? keV ] > V	47.801'438	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg	?	%	²⁰⁶Pb
Isotope_103_lr_253_u	Unstable	²⁵³Lr	Boson	103	p	150	n	7/2	-1	253.095'210'000'0	u	~ 0	%	~ 0	88.837'000'000'0	MeV	7.399'000'000'0	MeV	-	-	1.84E-8	year	580.000	milli-seconds ( x⁻³ )	90.000'000	%	α	8,936.660	keV	²⁴⁹Md	²⁵³Lr > [ 90 % , α , 8,936.66 keV ] > ²⁴⁹Md	SF	?	keV	V	²⁵³Lr > [ , SF , ? keV ] > V	1.000'000	%	β+	3,200.000	keV	²⁵³No	²⁵³Lr > [ 1 % , β+ , 3,200.0 keV ] > ²⁵³No	33.434'168	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_103_lr_254_u	Unstable	²⁵⁴Lr	Fermion	103	p	151	n	?	0	254.096'454'000'0	u	~ 0	%	~ 0	88.687'000'000'0	MeV	7.402'000'000'0	MeV	-	-	4.12E-7	year	13.000	seconds ( x⁰ )	76.000'000	%	α	8,786.000	keV	²⁵⁰Md	²⁵⁴Lr > [ 76 % , α , 8,786.0 keV ] > ²⁵⁰Md	β+	4,100.000	keV	²⁵⁴No	²⁵⁴Lr > [ , β+ , 4,100.0 keV ] > ²⁵⁴No	?	%	SF	?	keV	V	²⁵⁴Lr > [ ? % , SF , ? keV ] > V	29.269'089	%	²⁰⁶Pb	0.000'001	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_103_lr_255_u	Unstable	²⁵⁵Lr	Boson	103	p	152	n	7/2	-1	255.096'681'000'0	u	~ 0	%	~ 0	89.847'000'000'0	MeV	7.400'000'000'0	MeV	-	-	6.97E-7	year	22.000	seconds ( x⁰ )	69.000'000	%	α	8,605.000	keV	²⁵¹Md	²⁵⁵Lr > [ 69 % , α , 8,605.0 keV ] > ²⁵¹Md	β+	2,182.000	keV	²⁵⁵No	²⁵⁵Lr > [ , β+ , 2,182.0 keV ] > ²⁵⁵No	1.000'000	%	SF	?	keV	V	²⁵⁵Lr > [ 1 % , SF , ? keV ] > V	95.814'549	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁶Pb	0.000'000	%	¹⁶⁰Dy	0.000'000	%	¹⁴⁰Ce	?	%	¹⁷²Yb	?	%	¹⁷⁶Hf	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_103_lr_256_u	Unstable	²⁵⁶Lr	Fermion	103	p	153	n	?	0	256.098'629'000'0	u	~ 0	%	~ 0	90.057'000'000'0	MeV	7.402'000'000'0	MeV	-	-	8.56E-7	year	27.000	seconds ( x⁰ )	85.000'000	%	α	8,817.000	keV	²⁵²Md	²⁵⁶Lr > [ 85 % , α , 8,817.0 keV ] > ²⁵²Md	β+	3,027.000	keV	²⁵⁶No	²⁵⁶Lr > [ , β+ , 3,027.0 keV ] > ²⁵⁶No	0.030'000	%	SF	?	keV	V	²⁵⁶Lr > [ 0.03 % , SF , ? keV ] > V	100.110'376	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg	0.000'000	%	²⁰⁸Pb
Isotope_103_lr_257_u	Unstable	²⁵⁷Lr	Boson	103	p	154	n	9/2	1	257.099'555'000'0	u	~ 0	%	~ 0	91.872'000'000'0	MeV	7.398'000'000'0	MeV	-	-	2.05E-8	year	646.000	milli-seconds ( x⁻³ )	100.000'000	%	α	9,009.000	keV	²⁵³Md	²⁵⁷Lr > [ 100 % , α , 9,009.0 keV ] > ²⁵³Md	β+	1,472.000	keV	²⁵⁷No	²⁵⁷Lr > [ , β+ , 1,472.0 keV ] > ²⁵⁷No	0.001'000	%	SF	?	keV	V	²⁵⁷Lr > [ 0.001 % , SF , ? keV ] > V
Isotope_103_lr_258_u	Unstable	²⁵⁸Lr	Fermion	103	p	155	n	?	0	258.101'814'000'0	u	~ 0	%	~ 0	92.735'000'000'0	MeV	7.397'000'000'0	MeV	-	-	1.30E-7	year	4.100	seconds ( x⁰ )	95.000'000	%	α	8,900.000	keV	²⁵⁴Md	²⁵⁸Lr > [ 95 % , α , 8,900.0 keV ] > ²⁵⁴Md	β+	2,338.000	keV	²⁵⁸No	²⁵⁸Lr > [ , β+ , 2,338.0 keV ] > ²⁵⁸No								95.042'001	%	²⁰⁶Pb	0.000'002	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_103_lr_259_u	Unstable	²⁵⁹Lr	Boson	103	p	156	n	9/2	1	259.102'901'000'0	u	~ 0	%	~ 0	94.839'000'000'0	MeV	7.391'000'000'0	MeV	-	-	1.96E-7	year	6.200	seconds ( x⁰ )	78.000'000	%	α	8,584.000	keV	²⁵⁵Md	²⁵⁹Lr > [ 78 % , α , 8,584.0 keV ] > ²⁵⁵Md	SF	?	keV	V	²⁵⁹Lr > [ , SF , ? keV ] > V	0.600'000	%	β+	720.000	keV	²⁵⁹No	²⁵⁹Lr > [ 0.6 % , β+ , 720.0 keV ] > ²⁵⁹No	78.668'723	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁶Pb	0.000'000	%	¹⁶⁰Dy	0.000'000	%	¹⁴⁰Ce	?	%	¹⁷²Yb	?	%	¹⁷⁶Hf	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_103_lr_260_u	Unstable	²⁶⁰Lr	Fermion	103	p	157	n	?	0	260.105'504'000'0	u	~ 0	%	~ 0	95.852'000'000'0	MeV	7.390'7.390'7.390'7.390	MeV	-	-	5.70E-6	year	180.000	seconds ( x⁰ )	80.000'000	%	α	8,236.000	keV	²⁵⁶Md	²⁶⁰Lr > [ 80 % , α , 8,236.0 keV ] > ²⁵⁶Md	β+	1,643.000	keV	²⁶⁰No	²⁶⁰Lr > [ , β+ , 1,643.0 keV ] > ²⁶⁰No								6.500'187	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg	0.000'000	%	²⁰⁸Pb
Isotope_103_lr_261_u	Unstable	²⁶¹Lr	Boson	103	p	158	n	?	0	261.106'883'000'0	u	~ 0	%	~ 0	98.276'000'000'0	MeV	7.383'000'000'0	MeV	-	-	7.29E-5	year	2.300	kilo-seconds ( x³ )	?	%	SF	?	keV	V	²⁶¹Lr > [ ? % , SF , ? keV ] > V	α	8,140.000	keV	²⁵⁷Md	²⁶¹Lr > [ , α , 8,140.0 keV ] > ²⁵⁷Md								?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_103_lr_262_u	Unstable	²⁶²Lr	Fermion	103	p	159	n	?	0	262.109'634'000'0	u	~ 0	%	~ 0	99.561'000'000'0	MeV	7.381'000'000'0	MeV	-	-	3.17E-4	year	10.008	kilo-seconds ( x³ )	10.000'000	%	SF	?	keV	V	²⁶²Lr > [ 10 % , SF , ? keV ] > V	α	8,010.000	keV	²⁵⁸Md	²⁶²Lr > [ , α , 8,010.0 keV ] > ²⁵⁸Md	?	%	β+	1,151.000	keV	²⁶²No	²⁶²Lr > [ ? % , β+ , 1,151.0 keV ] > ²⁶²No	?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb
Isotope_103_lr_263_u	Unstable	²⁶³Lr	Boson	103	p	160	n	?	0	263.111'293'000'0	u	~ 0	%	~ 0	102.123'000'000'0	MeV	7.374'000'000'0	MeV	-	-	6.34E-4	year	20.016	kilo-seconds ( x³ )	?	%	α	7,620.000	keV	²⁵⁹Md	²⁶³Lr > [ ? % , α , 7,620.0 keV ] > ²⁵⁹Md													?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb	?	%	²⁰⁶Pb	?	%	¹⁷⁶Hf	?	%	¹⁶⁰Dy	?	%	¹⁴⁰Ce	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_103_lr_264_u	Unstable	²⁶⁴Lr	Fermion	103	p	161	n	?	0	264.114'038'000'0	u	~ 0	%	~ 0	103.669'000'000'0	MeV	7.371'000'000'0	MeV	-	-	1.14E-3	year	36.000	kilo-seconds ( x³ )	?	%	α	7,250.000	keV	²⁶⁰Md	²⁶⁴Lr > [ ? % , α , 7,250.0 keV ] > ²⁶⁰Md	SF	?	keV	V	²⁶⁴Lr > [ , SF , ? keV ] > V								?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg	?	%	²⁰⁶Pb
Isotope_103_lr_265_u	Unstable	²⁶⁵Lr	Boson	103	p	162	n	?	0	265.115'839'000'0	u	~ 0	%	~ 0	106.226'000'000'0	MeV	7.364'000'000'0	MeV	-	-	1.14E-3	year	36.000	kilo-seconds ( x³ )	?	%	α	7,000.000	keV	²⁶¹Md	²⁶⁵Lr > [ ? % , α , 7,000.0 keV ] > ²⁶¹Md	SF	?	keV	V	²⁶⁵Lr > [ , SF , ? keV ] > V								?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_103_lr_266_u	Unstable	²⁶⁶Lr	Fermion	103	p	163	n	?	0	266.119'305'000'0	u	~ 0	%	~ 0	107.903'000'000'0	MeV	7.360'000'000'0	MeV	-	-	1.27E-4	year	3.996	kilo-seconds ( x³ )	?	%	α	7,300.000	keV	²⁶²Md	²⁶⁶Lr > [ ? % , α , 7,300.0 keV ] > ²⁶²Md	SF	?	keV	V	²⁶⁶Lr > [ , SF , ? keV ] > V								?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb

103 – Lawrencium, Lr

103 – Lawrencium, Lr

103 – Lawrencium, Lr

103 – Lawrencium, Lr

103 – Lawrencium, Lr

Spectrograph

Elemental Tile

Lawrencium

Spectrograph

Elemental Tile

Lawrencium

Spectrograph

Elemental Tile

Lawrencium

Spectrograph

Elemental Tile

Lawrencium

Spectrograph

Elemental Tile

Lawrencium