Plutonium

Plutonium,  ₉₄Pu

General properties
Appearance	silvery white, tarnishing to dark gray in air
Mass nummer	244 (most stable isotope)
Plutonium in the periodic cairt
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 Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) 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 Gowd Mercur (element) Thallium Leid (element) 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 Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Sm ↑ Pu ↓ (Uqh) neptunium ← plutonium → americium
Atomic nummer (Z)	94
Group	group n/a
Period	period 7
Element category	actinide
Block	f-block
Electron confeeguration	[Rn] 5f6 7s2
Electrons per shell	2, 8, 18, 32, 24, 8, 2
Pheesical properties
Phase (at STP)	solit
Meltin pynt	912.5 K ​(639.4 °C, ​1182.9 °F)
Bylin pynt	3505 K ​(3228 °C, ​5842 °F)
Density (near r.t.)	19.816 g/cm3
when liquid (at m.p.)	16.63 g/cm3
Heat o fusion	2.82 kJ/mol
Heat o vapourisation	333.5 kJ/mol
Molar heat capacity	35.5 J/(mol·K)
Vapour pressur P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1756 1953 2198 2511 2926 3499
Atomic properties
Oxidation states	8, 7, 6, 5, 4, 3, 2, 1 ​(an amphoteric oxide)
Electronegativity	Pauling scale: 1.28
Ionisation energies	1st: 584.7 kJ/mol
Atomic radius	empirical: 159 pm
Covalent radius	187±1 pm
Spectral lines
Miscellanea
Creestal structur	​monoclinic
Speed o soond	2260 m/s
Thermal expansion	46.7 µm/(m·K) (at 25 °C)
Thermal conductivity	6.74 W/(m·K)
Electrical resistivity	1.460 µΩ·m (at 0 °C)
Magnetic orderin	paramagnetic
Young's modulus	96 GPa
Shear modulus	43 GPa
Poisson ratio	0.21
CAS Nummer	7440-07-5
History
Namin	after dwarf planet Pluto, itsel named efter clessical god o the unnerwarld Pluto
Diskivery	Glenn T. Seaborg, Arthur Wahl, Joseph W. Kennedy, Edwin McMillan (1940–1)
Main isotopes o plutonium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct 238Pu trace 87.74 y SF – α 234U 239Pu trace 2.41×104 y SF – α 235U 240Pu trace 6.5×103 y SF – α 236U 241Pu syn 14 y β− 241Am SF – 242Pu syn 3.73×105 y SF – α 238U 244Pu trace 8.08×107 y α 240U SF –

Plutonium is a transuranic radioactive chemical element wi seembol Pu an atomic nummer 94.