Protaktinium

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Protaktinium,  91Pa
Protactinium.jpg
Sifat umum
Nama, simbol protaktinium, Pa
Pengucapan /ˌprtækˈtɪniəm/
PROH-tak-TIN-ee-əm
Penampilan silver metalik terang
Protaktinium di tabel periodik
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Litium (alkali metal)
Berilium (alkaline earth metal)
Boron (metalloid)
Karbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oksigen (diatomic nonmetal)
Fluor (diatomic nonmetal)
Neon (noble gas)
Natrium (alkali metal)
Magnesium (alkaline earth metal)
Aluminium (post-transition metal)
Silikon (metalloid)
Fosfor (polyatomic nonmetal)
Belerang (polyatomic nonmetal)
Klor (diatomic nonmetal)
Argon (noble gas)
Kalium (alkali metal)
Kalsium (alkaline earth metal)
Skandium (transition metal)
Titanium (transition metal)
Vanadium (transition metal)
Kromium (transition metal)
Mangan (transition metal)
Besi (transition metal)
Kobalt (transition metal)
Nikel (transition metal)
Tembaga (transition metal)
Seng (transition metal)
Galium (post-transition metal)
Germanium (metalloid)
Arsenik (metalloid)
Selenium (polyatomic nonmetal)
Bromin (diatomic nonmetal)
Kripton (noble gas)
Rubidium (alkali metal)
Stronsium (alkaline earth metal)
Itrium (transition metal)
Zirkonium (transition metal)
Niobium (transition metal)
Molibdenum (transition metal)
Teknesium (transition metal)
Rutenium (transition metal)
Rodium (transition metal)
Paladium (transition metal)
Perak (transition metal)
Kadmium (transition metal)
Indium (post-transition metal)
Timah (post-transition metal)
Antimon (metalloid)
Telurium (metalloid)
Yodium (diatomic nonmetal)
Xenon (noble gas)
Sesium (alkali metal)
Barium (alkaline earth metal)
Lantanum (lanthanide)
Serium (lanthanide)
Praseodimium (lanthanide)
Neodimium (lanthanide)
Prometium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Disprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Tulium (lanthanide)
Iterbium (lanthanide)
Lutesium (lanthanide)
Hafnium (transition metal)
Tantalum (transition metal)
Tungsten (transition metal)
Renium (transition metal)
Osmium (transition metal)
Iridium (transition metal)
Platinum (transition metal)
Emas (transition metal)
Raksa (transition metal)
Talium (post-transition metal)
Timbal (post-transition metal)
Bismut (post-transition metal)
Polonium (post-transition metal)
Astatin (metalloid)
Radon (noble gas)
Fransium (alkali metal)
Radium (alkaline earth metal)
Aktinium (actinide)
Torium (actinide)
Protaktinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Amerisium (actinide)
Kurium (actinide)
Berkelium (actinide)
Kalifornium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrensium (actinide)
Ruterfordium (transition metal)
Dubnium (transition metal)
Seaborgium (transition metal)
Bohrium (transition metal)
Hasium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Kopernisium (transition metal)
Nihonium (unknown chemical properties)
Flerovium (post-transition metal)
Moskovium (unknown chemical properties)
Livermorium (unknown chemical properties)
Tenesin (unknown chemical properties)
Oganeson (unknown chemical properties)
Pr

Pa

(Uqu)
toriumprotaktiniumuranium
Nomor atom (Z) 91
Golongan, blok n/a, blok-f
Periode periode 7
Kategori unsur   aktinida
Massa atom standar (Ar) 231.03588
Konfigurasi elektron [Rn] 5f2 6d1 7s2
per kulit
2, 8, 18, 32, 20, 9, 2
Sifat fisika
Fase solid
Titik lebur 1841 K ​(1568 °C, ​2854 °F)
Titik didih ? 4300 K ​(? 4027 °C, ​? 7280 °F)
Kepadatan mendekati s.k. 15.37 g/cm3
Kalor peleburan 12.34 kJ/mol
Kalor penguapan 481 kJ/mol
Sifat atom
Bilangan oksidasi 2, 3, 4, 5
(oksida basa lemah)
Elektronegativitas Skala Pauling: 1.5
Jari-jari atom empiris: 163 pm
Jari-jari kovalen 200 pm
Lain-lain
Struktur kristal tetragon[1]
Struktur kristal Tetragonal untuk protaktinium
Kondusivitas termal 47 W/(m·K)
Resistivitas listrik 177 n Ω·m (suhu 0 °C)
Arah magnet paramagnetik[2]
Nomor CAS 7440-13-3
Isotop protaktinium terstabil
iso NA waktu paruh DM DE (MeV) DP
229Pa syn 1.4 d α 5.58 225Ac
230Pa syn 17.4 d ε 1.310 230Th
β 0.563 230U
231Pa ~100% 32760 y α 5.149 227Ac
232Pa syn 1.31 d β 0.31 232U
233Pa syn 26.967 d β 0.571 233U
234mPa trace 1.17 min β 2.29 234U
IT 0.0694 234Pa
234Pa trace 6.75 h β 0.23 234U
| referensi | di Wikidata

Protaktinium adalah suatu unsur kimia dalam tabel periodik yang memiliki lambang Pa dan nomor atom 91.

Referensi[sunting | sunting sumber]

  1. ^ Donohue, J. (1959). "On the crystal structure of protactinium metal". Acta Crystallographica 12 (9): 697. doi:10.1107/S0365110X59002031. 
  2. ^ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.

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