Promethium

Promethium (pípè /prɵˈmiːθiəm/, pro-MEE-thee-əm) je apilese kemika to ni ami-idamo Pm ati nomba atomu 61. O yato si awon apilese yioku nitori pe oun nika ni apilese radioalagbara leyin technetium to je titele pelu awon apilese kemika ti awon isotopu won duro sinsin.

Promethium, ₆₁Pm

Promethium
Pípè	/proʊˈmiːθiəm/ ​(proh-MEE-thee-əm)
Ìhànsójú	metallic
nọ́mbà ìsújọ	[145]
Promethium ní orí tábìlì àyè
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 Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton 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 - ↑ Pm ↓ Np neodymium ← promethium → samarium
Nọ́mbà átọ̀mù (Z)	61
Ẹgbẹ́	group n/a
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Lanthanide
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f5 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 23, 8, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1315 K ​(1042 °C, ​1908 °F)
Ígbà ìhó	3273 K ​(3000 °C, ​5432 °F)
Kíki (near r.t.)	7.26 g/cm3
Heat of fusion	7.13 kJ/mol
Heat of	289 kJ/mol
Atomic properties
Oxidation states	+2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: ? 1.13
Atomic radius	empirical: 183 pm
Covalent radius	199 pm
Color lines in a spectral range Spectral lines of promethium
Other properties
Natural occurrence	primordial
Crystal structure	​hexagonal
Thermal expansion	(r.t.) (α, poly) est. 11 µm/(m·K)
Thermal conductivity	17.9 W/(m·K)
Electrical resistivity	(r.t.) est. 0.75 µ Ω·m
Magnetic ordering	paramagnetic
Young's modulus	(α form) est. 46 GPa
Shear modulus	(α form) est. 18 GPa
Bulk modulus	(α form) est. 33 GPa
Poisson ratio	(α form) est. 0.28
CAS Number	7440-12-2
Main isotopes of promethium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 145Pm syn 17.7 y ε 0.163 145Nd 146Pm syn 5.53 y ε 1.472 146Nd β− 1.542 146Sm 147Pm trace 2.6234 y β− 0.224 147Sm