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


Name Curium Symbol Cm
atomic number 96 Atomic weight (247)
Density @ 293 K 13.5 g/cm3 Atomic volume 18.28 cm3/mol
Group Rare Earth, Actinides discovered 1944


state (s, l, g) s
melting point 1613.2 K boiling point K
Heat of fusion 15.0 kJ/mol Heat of vaporization ?
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1st ionization energy 581 kJ/mole electronegativity 1.3
2nd ionization energy kJ/mole electron affinity kJ/mole
3rd ionization energy kJ/mole Specific heat ?
heat atomization kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,32,25,9,2 electron configuration [Rn] 5f7 6d1 7s2
minimum oxidation number 0 maximum oxidation number 4
min. common oxidation no. 0 max. common oxidation no. 3
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Appearance & Characteristics

structure fcc: face-centered cubic color silvery-white
uses thermoelec. pwr, n source toxicity
hardness mohs characteristics Radioactive


reaction with air reaction with 6M HCl
reaction with 6M HCl reaction with 15M HNO3
reaction with 6M NaOH
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Other Forms

number of isotopes 0 hydride(s) CmH2
oxide(s) CmO Cm2O3 CmO2 chloride(s) CmCl3


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 174 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) 111 pm
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thermal conductivity J/m-sec-deg electrical conductivity 1/mohm-cm
polarizability 23 A^3


source Synthetic rel. abund. solar system log
abundance earth's crust log cost, pure $/100g
cost, bulk $/100g
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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.