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Kurium

96Cm
Kurium
Konfigurasi elektron kurium
Garis spektrum kurium
Sifat umum
Nama, lambangkurium, Cm
Pengucapan/kurium/[1]
Penampilanmetalik keperakan, bersinar ungu dalam gelap
Kurium dalam tabel periodik
Perbesar gambar

96Cm
Hidrogen Helium
Lithium Berilium Boron Karbon Nitrogen Oksigen Fluor Neon
Natrium Magnesium Aluminium Silikon Fosfor Sulfur Clor Argon
Potasium Kalsium Skandium Titanium Vanadium Chromium Mangan Besi Cobalt Nikel Tembaga Seng Gallium Germanium Arsen Selen Bromin Kripton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver 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 Gold Mercury (element) Thallium Lead 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 Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Gd

Cm

(Upn)
amerisiumkuriumberkelium
Lihat bagan navigasi yang diperbesar
Nomor atom (Z)96
Golongangolongan n/a
Periodeperiode 7
Blokblok-f
Kategori unsur  aktinida
Nomor massa[247]
Konfigurasi elektron[Rn] 5f7 6d1 7s2
Elektron per kelopak2, 8, 18, 32, 25, 9, 2
Sifat fisik
Fase pada STS (0 °C dan 101,325 kPa)padat
Titik lebur1613 K ​(1340 °C, ​2444 °F)
Titik didih3383 K ​(3110 °C, ​5630 °F)
Kepadatan mendekati s.k.13,51 g/cm3
Kalor peleburan13,85 kJ/mol
Tekanan uap
P (Pa) 1 10 100 1 k 10 k 100 k
pada T (K) 1788 1982        
Sifat atom
Bilangan oksidasi+3, +4, +5,[2] +6[3] (oksida amfoter)
ElektronegativitasSkala Pauling: 1,3
Energi ionisasike-1: 581 kJ/mol
Jari-jari atomempiris: 174 pm
Jari-jari kovalen169±3 pm
Lain-lain
Kelimpahan alamisintetis
Struktur kristalsusunan padat heksagon ganda (dhcp)
Struktur kristal Double hexagonal close packed untuk kurium
Resistivitas listrik1,25 µΩ·m[4]
Arah magnetantiferomagnetik-berubah menjadi paramagnetik pada suhu 52 K[4]
Nomor CAS7440-51-9
Sejarah
Penamaandinamai dari M. Skłodowska-Curie dan P. Curie
PenemuanGlenn T. Seaborg, Ralph A. James, A. Ghiorso (1944)
Isotop kurium yang utama
Iso­top Kelim­pahan Waktu paruh (t1/2) Mode peluruhan Pro­duk
242Cm sintetis 160 hri SF
α 238Pu
243Cm sintetis 29,1 thn α 239Pu
ε 243Am
SF
244Cm sintetis 18,1 thn SF
α 240Pu
245Cm sintetis 8500 thn SF
α 241Pu
246Cm sintetis 4730 thn α 242Pu
SF
247Cm sintetis 1,56×107 thn α 243Pu
248Cm sintetis 3,40×105 thn α 244Pu
SF
250Cm sintetis 9000 thn SF
α 246Pu
β 250Bk
| referensi | di Wikidata

Kurium (pengucapan: /ˈkjuːriəm/) adalah unsur kimia sintetik dalam sistem periodik unsur yang memiliki lambang Cm dan nomor atom 96. Nama elemen ini diambil dari nama ilmuwan Marie Curie.

Sejarah

Meski kurium mengikuti amerisium dalam tabel periodik, sebenarnya unsur ini adalah unsur transuranium yang ditemukan ketiga. Diidentifikasi oleh James, Seaborg dan Ghiorso pada tahun 1944 ketika terjadi masa perang laboratorium metalurgi di Universitas Chicago dalam siklotron 60 inci. 242Cm sebanyak 30 miligram, dalam bentuk hidroksida, diisolasi pertamakali oleh Werner dan Perlman di Universitas Kalifornia pada tahun 1947. Pada tahun 1950, Crane, Wallmann dan Cunningham menemukan kerentanan terhadap magnet pada sejumlah miligram CmF3 dengan tingkat magnitud seperti GdF3. Hal ini adalah sekaligus sebagai bukti eksperimen yang menunjukan konfigurasi elektron Cm+3. Pada tahun 1951, para ahli kimia yang sama membuat kurium dalam bentuk unsur untuk pertamakalinya. sekarang telah dikenali 14 isotop kurium.

Referensi

  1. ^ (Indonesia) "Kurium". KBBI Daring. Diakses tanggal 17 Juli 2022. 
  2. ^ 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. OSTI 1631597. PMID 30040397. 
  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. 
  4. ^ a b 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. 

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