Curium, 96 General properties Pronunciation Template:Infobox element/pronunciation Appearance silvery metallic, glows purple in the dark Standard atomic weight (A r, standard ) Template:Infobox element/standard atomic weight Mass number Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)Curium in the periodic table Template:Infobox element/periodic table Atomic number (Z ) 96 Group Template:Infobox element/group Period period 7 Block f-block Element category Template:Infobox element/category format Electron configuration [Rn ] 5f7 6d1 7s2 Electrons per shell
2, 8, 18, 32, 25, 9, 2 Physical properties Phase at STP 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|Template:Engvar pressure Atomic properties Oxidation states Template:Infobox element/symbol-to-oxidation-state Electronegativity Pauling scale: 1.3 [[Ionization energy|Template:Engvar energies]] Atomic radius empirical: 174 pm Covalent radius 169±3 pm Template:Infobox element/spectral lines Other properties Crystal structure Template:Infobox element/crystal structure Electrical resistivity 1.25 µΩ·m[1] Magnetic ordering antiferromagnetic-paramagnetic transition at 52 K[1] 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) Main isotopes of curium Template:Infobox element/isotopes table | references
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↑ 1.0 1.1 Schenkel, R. (1977). "The electrical resistivity of 244Cm metal". Solid State Communications . 23 (6): 389. Bibcode :1977SSCom..23..389S . doi :10.1016/0038-1098(77)90239-3 . ↑ Domanov, V. P.; Lobanov, Yu. V. (October 2011). "Formation of volatile curium(VI) trioxide CmO3 ". Radiochemistry . SP MAIK Nauka/Interperiodica. 53 (5): 453–6. doi :10.1134/S1066362211050018 . ↑ Kovács, Attila; Dau, Phuong D.; Marçalo, Joaquim; Gibson, John K. (2018). "Pentavalent Curium, Berkelium, and Californium in Nitrate Complexes: Extending Actinide Chemistry and Oxidation States". Inorg. Chem . American Chemical Society. 57 (15): 9453–9467. doi :10.1021/acs.inorgchem.8b01450 . 