Curium

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Curium, 96Cm
Curium
Pronunciation/ˈkjʊəriəm/ (KEWR-ee-əm)
Appearancesillery metallic, glows purpie in the dark
Mass number[247]
Curium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Gd

Cm

(Uqo)
americiumcuriumberkelium
Atomic nummer (Z)96
Groupgroup n/a
Periodperiod 7
Blockf-block
Element category  Actinide
Electron confeeguration[Rn] 5f7 6d1 7s2
Electrons per shell2, 8, 18, 32, 25, 9, 2
Pheesical properties
Phase at STPsolit
Meltin pynt1613 K ​(1340 °C, ​2444 °F)
Bylin pynt3383 K ​(3110 °C, ​5630 °F)
Density (near r.t.)13.51 g/cm3
Heat o fusion13.85 kJ/mol
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1788 1982
Atomic properties
Oxidation states+2, +3, +4, +5,[1] +6[2] (an amphoteric oxide)
ElectronegativityPauling scale: 1.3
Ionisation energies
  • 1st: 581 kJ/mol
Atomic radiusempirical: 174 pm
Covalent radius169±3 pm
Colour lines in a spectral range
Spectral lines o curium
Ither properties
Naitural occurrencesynthetic
Creestal structur ​dooble hexagonal close packed
[[File:dooble hexagonal close packed|frameless|alt=Dooble hexagonal close packed creestal structur for curium|upright=0.23|Dooble hexagonal close packed creestal structur for curium]]
Electrical resistivity1.25 µΩ·m[3]
Magnetic orderinantiferromagnetic-paramagnetic transition at 52 K[3]
CAS Nummer7440-51-9
History
Naminnamed after Marie Skłodowska-Curie an Pierre Curie
DiskiveryGlenn T. Seaborg, Ralph A. James, Albert Ghiorso (1944)
Main isotopes o curium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
242Cm syn 160 d SF
α 238Pu 243Cm syn 29.1 y α 239Pu
ε 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 246Pu
β 250Bk
| references

Curium is a transuranic radioactive chemical element wi seembol Cm an atomic nummer 96.

References[eedit | eedit soorce]

  1. 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. PMID 30040397.
  2. 2.0 2.1 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.
  3. 3.0 3.1 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.