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americiumcuriumberkelium
Gd

Cm

(Upn)
Appearance
silvery metallic, glows purple in the dark
General properties
Name, symbol, number curium, Cm, 96
Group, period, block [[group {{{group}}} element|{{{group}}}]], 7, f
Standard atomic weight {{{atomic mass}}} g/mol
Electron configuration [Rn] 5f7 6d1 7s2
Electrons per shell 2, 8, 18, 32, 25, 9, 2 (Image)
Physical properties
Phase solid
Density (near r.t.) 13.51 g/cm3
Melting point 1613 K, 1340 °C, 2444 °F
Boiling point 3383 K, 3110 °C, 5630 °F
Heat of fusion 13.85 kJ/mol
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1788 1982
Atomic properties
Oxidation states 6, 5, 4, 3, 2
((an amphoteric oxide))
Electronegativity 1.3 (Pauling scale)
Ionization energies 1st: {{{1st ionization energy}}} kJ/mol
Atomic radius 174 pm
Covalent radius 169±3 pm
Miscellanea
Crystal structure double hexagonal close packed
Magnetic ordering antiferromagnetic-paramagnetic transition at 52 K
Electrical resistivity 1.25Ω·m
CAS registry number 7440-51-9
Most stable isotopes
Main article: Isotopes of curium
iso NA half-life DM DE (MeV) DP
242Cm syn 160 d SF
α 238Pu
243Cm syn 29.1 y α 6.169 239Pu
ε 0.009 243Am
SF
244Cm syn 18.1 y SF
α 240Pu
245Cm syn 8500 y SF
α 241Pu
246Cm syn 4730 y α 242Pu
SF
247Cm syn 1.56×107 y α 243Pu
248Cm syn 3.40×105 y α 244Pu
SF
250Cm syn 9000 y SF
α 5.169 246Pu
β 0.037 250Bk

Curium is a chemical element. It is a radioactive metal. It has the chemical symbol Cm. It has the atomic number 96. In chemistry it is placed in a group of metal elements named the actinides. Curium is a transuranic element. It is a radioactive element that does not exist in nature. Curium has to be made in a lab. Curium has a silver color and it is made by bombarding a plutonium target with alpha particles (helium ions). Curium was named after Marie Curie and her husband Pierre.

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