Template:Infobox curium

Curium,  ₉₆Cm

General properties
Name, symbol	curium, Cm
Appearance	silvery metallic, glows purple in the dark
Pronunciation	/ˈkjʊəriəm/ KEWR-ee-əm
Curium in the periodic table
Gd ↑ Cm ↓ (Uqo) americium ← curium → berkelium
Atomic number (Z)	96
Group, block	group n/a, f-block
Period	period 7
Element category	actinide
Standard atomic weight (Ar)	(247)
Electron configuration	[Rn] 5f7 6d1 7s2
per shell	2, 8, 18, 32, 25, 9, 2
Physical properties
Phase	solid
Melting point	1613 K ​(1340 °C, ​2444 °F)
Boiling point	3383 K ​(3110 °C, ​5630 °F)
Density near r.t.	13.51 g/cm3
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, 4, 3, 2 ​(an amphoteric oxide)
Electronegativity	Pauling scale: 1.3
Ionization energies	1st: 581 kJ/mol
Atomic radius	empirical: 174 pm
Covalent radius	169±3 pm
Miscellanea
Crystal structure	​double hexagonal close-packed (dhcp)
Electrical resistivity	1.25 µΩ·m
Magnetic ordering	antiferromagnetic-paramagnetic transition at 52 K
CAS Number	7440-51-9
History
Naming	named after Marie Skłodowska-Curie and Pierre Curie
Discovery	Glenn T. Seaborg, Ralph A. James, Albert Ghiorso (1944)
Most stable isotopes of curium
iso NA half-life DM DE (MeV) DP 242Cm syn 160 d SF – – α 6.1 238Pu 243Cm syn 29.1 y α 6.169 239Pu ε 0.009 243Am SF – – 244Cm syn 18.1 y SF – – α 5.8048 240Pu 245Cm syn 8500 y SF – – α 5.623 241Pu 246Cm syn 4730 y α 5.475 242Pu SF – – 247Cm syn 1.56×107 y α 5.353 243Pu 248Cm syn 3.40×105 y α 5.162 244Pu SF – – 250Cm syn 9000 y SF – – α 5.169 246Pu β− 0.037 250Bk

References

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