Promethium 61

Atomic No. Order:

Alphabetic Order:

2, 8, 18,

23, 8, 2

Pm
61

Np
93

Uqt
143

Uet
193

Promethium

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

[ 145 ]

Atomic Radius pm

181

First Ionisation Energy
kJ mol ^-1

535.9

Electronegativity

n/a

Density kg m ^-3

7220 [298 K]

Molar Volume cm ³

20.1

Thermal Conductivity
W m ^-1 K ^-1

17.9 [300 K] (est.)

Melting Point K

1441

Boiling Point K

c. 3000

Number of Isotopes

Inner/outer Shells

Inner/outer Orbitals

Filling Orbital

4f ⁵

Ground State Electron Configuration

[Xe]

4f ⁵

5p ⁶

6s ²

Ground State Electron Configuration with free Orbitals (n=25)

0, 0, 0, 9, 10, 6

Ground State Electron Configuration with compressed Orbitals (n=96)

0, 0, 0, 0, 32, 64

Singularity

182

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

Term Symbol

⁶H _5/2

Discovery

Discovered by J.A. Marinsky, L.E. Glendenin and C.D. Coryell (Oak Ridge, Tennessee, USA) in 1945

Name Derived From

Named after Prometheus (from Greek mythology)

APSIDIUM ©	Created:		2002-07-29		061.pdf
	Page update:		2004-12-21		061.pdf