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Prometium adalah suatu unsur kimia dalam tabel periodik yang memiliki lambang Pm dan nomor atom 61.

Prometium,  61Pm
Sifat umum
Nama, simbol prometium, Pm
Pengucapan /prˈmθiəm/ pro-MEE-thee-əm
Penampilan metalik
Prometium 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)
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Pm

Np
neodimiumprometiumsamarium
Nomor atom (Z) 61
Golongan, blok golongan n/a, blok-f
Periode periode 6
Kategori unsur   lantanida
Bobot atom standar (Ar) [145]
Konfigurasi elektron [Xe] 6s2 4f5
per kelopak
2, 8, 18, 23, 8, 2
Sifat fisika
Fase solid
Titik lebur 1315 K ​(1042 °C, ​1908 °F)
Titik didih 3273 K ​(3000 °C, ​5432 °F)
Kepadatan mendekati s.k. 7.26 g/cm3
Kalor peleburan 7.13 kJ/mol
Kalor penguapan 289 kJ/mol
Sifat atom
Bilangan oksidasi 3 (sedikit oksida basa
Elektronegativitas Skala Pauling: ? 1.13
Jari-jari atom empiris: 183 pm
Jari-jari kovalen 199 pm
Lain-lain
Struktur kristal heksagon
Struktur kristal Hexagonal untuk prometium
Ekspansi kalor (r.t.) (α, poly)
est. 11 µm/(m·K)
Konduktivitas termal 17.9 W/(m·K)
Resistivitas listrik (r.t.) est. 0.75 µ Ω·m
Arah magnet paramagnetik[1]
Modulus Young (α form) est. 46 GPa
Modulus Shear (α form) est. 18 GPa
Modulus Bulk (α form) est. 33 GPa
Rasio Poisson (α form) est. 0.28
Nomor CAS 7440-12-2
Isotop prometium terstabil
Iso­top Kelim­pahan Waktu paruh (t1/2) Moda peluruhan Pro­duk
145Pm syn 17.7 thn ε 145Nd
146Pm syn 5.53 y ε 146Nd
β 146Sm
147Pm sisa 2.6234 thn β 147Sm
| referensi | di Wikidata

ReferensiSunting

  1. ^ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.