Berkelium is a transuranic radioactive chemical element wi seembol Bk an atomic nummer 97.

Berkelium, 97Bk
Template:Infobox element/symbol-to-top-image/alt
Berkelium
Pronunciation
Appearancesillery
Mass number[247]
Berkelium 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
Tb

Bk

(Uqe)
curiumberkeliumcalifornium
Atomic nummer (Z)97
Groupgroup n/a
Periodperiod 7
Blockf-block
Element category  Actinide
Electron confeeguration[Rn] 5f9 7s2
Electrons per shell2, 8, 18, 32, 27, 8, 2
Pheesical properties
Phase at STPsolit
Meltin pyntbeta: 1259 K ​(986 °C, ​1807 °F)
Bylin pyntbeta: 2900 K ​(2627 °C, ​4760 °F)
Density (near r.t.)alpha: 14.78 g/cm3
beta: 13.25 g/cm3
Heat o fusion7.92 kJ/mol (calculatit)
Atomic properties
Oxidation states+2, +3, +4, +5[1]
ElectronegativityPauling scale: 1.3
Ionisation energies
  • 1st: 601 kJ/mol
Atomic radiusempirical: 170 pm
Colour lines in a spectral range
Spectral lines o berkelium
Ither properties
Naitural occurrencesynthetic
Creestal structur ​dooble hexagonal close packed
[[File:dooble hexagonal close packed|frameless|alt=Dooble hexagonal close packed creestal structur for berkelium|upright=0.23|Dooble hexagonal close packed creestal structur for berkelium]]
Thermal conductivity10 W/(m·K)
Magnetic orderinparamagnetic
CAS Nummer7440-40-6
History
Naminafter Berkeley, Californie, whaur it was discovered
DiskiveryLawrence Berkeley Naitional Laboratory (1949)
Main isotopes o berkelium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
245Bk syn 4.94 d ε 245Cm
α 241Am
246Bk syn 1.8 d α 242Am
ε 246Cm
247Bk syn 1380 y α 243Am
248Bk syn >300 y[2] α 244Am 249Bk syn 330 d α 245Am
SF
β 249Cf
| references

ReferencesEedit

  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. Milsted, J.; Friedman, A. M.; Stevens, C. M. (1965). "The alpha half-life of berkelium-247; a new long-lived isomer of berkelium-248". Nuclear Physics. 71 (2): 299. doi:10.1016/0029-5582(65)90719-4.