Chemicool

Cm

96

(247)
Curium
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
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

States
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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Energies
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

Reactions
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

Radius
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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Conductivity
thermal conductivity J/m-sec-deg electrical conductivity 1/mohm-cm
polarizability 23 A^3

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