Protaktiníọ̀m

Protaktiníọ̀m tabi Protactinium je apilese kemika to ni ami-idamo Pa ati nomba atomu 91.

Protactinium, ₉₁Pa

Protactinium
Pípè	/ˌproʊtækˈtɪniəm/ ​(PROH-tak-TIN-ee-əm)
Ìhànsójú	bright, silvery metallic luster
Ìwúwo átọ̀mù Ar, std(Pa)	231.03588(1)
Protactinium 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 Pr ↑ Pa ↓ (Uqu) thorium ← protactinium → uranium
Nọ́mbà átọ̀mù (Z)	91
Ẹgbẹ́	group n/a
Àyè	àyè 7
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Actinide
Ìtò ẹ̀lẹ́ktrọ́nù	[Rn] 5f2 6d1 7s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 32, 20, 9, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1841 K ​(1568 °C, ​2854 °F)
Ígbà ìhó	? 4300 K ​(? 4027 °C, ​? 7280 °F)
Kíki (near r.t.)	15.37 g/cm3
Heat of fusion	12.34 kJ/mol
Heat of	481 kJ/mol
Atomic properties
Oxidation states	+2, +3, +4, +5 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.5
Atomic radius	empirical: 163 pm
Covalent radius	200 pm
Spectral lines of protactinium
Other properties
Natural occurrence	from decay
Crystal structure	​orthorhombic
Thermal conductivity	47 W/(m·K)
Electrical resistivity	177 n Ω·m (at 0 °C)
Magnetic ordering	paramagnetic
CAS Number	7440-13-3
Main isotopes of protactinium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 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