Lawrencium 103

Atomic No. Order:

Alphabetic Order:

Periodic Table

2, 8, 18, 32,

32, 9, 2

Lu
71

Lr
103

Upt
153

Bnt
203

Lawrencium

Symbol

Atomic Number

103

Relative Atomic Mass
¹²C = 12.0000

[ 262 ]
262.1097
3.6 h
Neutrons 159

Significant Atomic Mass

264
Neutrons 161

Atomic Radius pm

First Ionisation Energy
kJ mol ^-1

Ionisation Energy (eV)

4.9 ?

Electronegativity

1.3

Density kg m ^-3

Molar Volume cm ³

Thermal Conductivity
W m ^-1 K ^-1

10 [300 K] (est.)

Melting Point K

Boiling Point K

Number of Isotopes

254 Lr 13 s
255 Lr 21.8 s
256 Lr 27 s
257 Lr 0.65 s
258 Lr 4.1 s
259 Lr 6.2 s
260 Lr 3 min
261 Lr 39 min
262 Lr 3.6 h

Inner + outer Shells

Inner + outer Orbitals

103

Filling Orbital

6d ¹

Ground State Electron Configuration

[Rn]

5f ¹⁴

6d ¹

7s ²

Ground State Electron Configuration with
free Orbitals (n= 15)

0, 0, 0, 0, 0, 9, 6

Ground State Electron Configuration with compressed Orbitals (n= 162 )

0, 0, 0, 0, 18, 54, 90

Singularity

280

162

	s	p	d		f	g	h	i	j
1	2
2	2	6
3	2	6	10
4	2	6	10		14
5	2	6	10		14	18
6	2	6	1	9	14	18	22
7	2	6	10		14	18	22	26
8

Term Symbol

²P _1/2

CAS Reg-ID:

22537-19-5

Discovered by A. Ghiorso, A.E. Larsh, T. Sikkeland and R.M. Latimer (Berkeley, USA) in 1961

Obsolete Names

Unniltrium, Unt
eka-lutetium

Name Derived From

Named after E.O. Lawrence
(b. Aug. 8, 1901, Canton, S.D., U.S./ d. Aug. 27, 1958, Palo Alto, Calif. )

American physicist, winner of the 1939 Nobel Prize for Physics for his invention of the cyclotron, the first particle accelerator to achieve high energies. Lawrence earned his Ph.D. at Yale University in 1925. An assistant professor of physics at Yale (1927-28), he went to the University of California, Berkeley, as an associate professor and became full professor there in 1930.

APSIDIUM	Created:		2002-08-29		103.pdf
	Page update:		2006-11-05		103.pdf