Chemicool

Pm

61

(145)
Promethium
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
Name Promethium Symbol Pm
atomic number 61 Atomic weight (145)
Density @ 293 K 6.475 g/cm3 Atomic volume 22.39 cm3/mol
Group Rare Earth, Lanthanides discovered 1945

States
state (s, l, g) s
melting point 1353.2 K boiling point K
Heat of fusion ? Heat of vaporization ?
Back to the top

Energies
1st ionization energy 535.9 kJ/mole electronegativity 1.15
2nd ionization energy 1052 kJ/mole electron affinity 50 kJ/mole
3rd ionization energy 2150 kJ/mole Specific heat 0.18 J/gK
heat atomization 301 kJ/mole atoms

Oxidation & Electrons
Shells 2,8,18,23,8,2 electron configuration [Xe] 4f5 6s2
minimum oxidation number 0 maximum oxidation number 3
min. common oxidation no. 0 max. common oxidation no. 3
Back to the top

Appearance & Characteristics
structure cp: close packed (ABCB) color silvery-white
uses nuclear battery toxicity
hardness mohs characteristics Radioactive

Reactions
reaction with air vigorous, = Pm2O3 reaction with 6M HCl mild, = H2, PmCl3
reaction with 6M HCl mild, = H2, PmCl3 reaction with 15M HNO3 mild, = Pm(NO3)3
reaction with 6M NaOH
Back to the top

Other Forms
number of isotopes 0 hydride(s)
oxide(s) Pm2O3 chloride(s)

Radius
ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 183 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) 111 pm
Back to the top

Conductivity
thermal conductivity 17.9 J/m-sec-deg electrical conductivity 1/mohm-cm
polarizability 30.1 A^3

Abundance
source Synthetic rel. abund. solar system log
abundance earth's crust -19.3 log cost, pure $/100g
cost, bulk $/100g
Back to the top
World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.