మూస:Infobox cerium

సీరియం, ₀₀Ce

సీరియం
Pronunciation	/ˈsɪəriəm/ ​(SEER-ee-əm)
Appearance	silvery white
Standard atomic weight Ar°(Ce)
	140.116±0.001 140.12±0.01 (abridged)
సీరియం in the periodic table
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 Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium - ↑ Ce ↓ Th లాంథనం ← సీరియం → ప్రాసియోడిమియం
Group	మూస:Infobox element/symbol-to-group/format
Period	period 6
Block	f-block
Electron configuration	[Xe] 4f1 5d1 6s2
Electrons per shell	2, 8, 18, 19, 9, 2
Physical properties
Phase at STP	solid
Melting point	1068 K ​(795 °C, ​1463 °F)
Boiling point	3716 K ​(3443 °C, ​6229 °F)
Density (near r.t.)	6.770 g/cm3
when liquid (at m.p.)	6.55 g/cm3
Heat of fusion	5.46 kJ/mol
Heat of vaporization	398 kJ/mol
Molar heat capacity	26.94 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1992 2194 2442 2754 3159 3705
Atomic properties
Oxidation states	+1, +2, +3, +4 (a mildly basic oxide)
Electronegativity	Pauling scale: 1.12
Atomic radius	empirical: 181.8 pm
Covalent radius	204±9 pm
Spectral lines of సీరియం
Other properties
Natural occurrence	primordial
Crystal structure	​face-centered cubic (fcc)
Speed of sound thin rod	2100 m/s (at 20 °C)
Thermal expansion	(r.t.) (γ, poly) 6.3 µm/(m⋅K)
Thermal conductivity	11.3 W/(m⋅K)
Electrical resistivity	(r.t.) (β, poly) 828 n Ω⋅m
Magnetic ordering	paramagnetic
Young's modulus	(γ form) 33.6 GPa
Shear modulus	(γ form) 13.5 GPa
Bulk modulus	(γ form) 21.5 GPa
Poisson ratio	(γ form) 0.24
Mohs hardness	2.5
Vickers hardness	270 MPa
Brinell hardness	412 MPa
CAS Number	7440-45-1
History
Naming	after dwarf planet Ceres, itself named after Roman deity of agriculture Ceres
Discovery	Martin Heinrich Klaproth, Jöns Jakob Berzelius, Wilhelm Hisinger (1803)
First isolation	Carl Gustaf Mosander (1839)
Isotopes of సీరియం

References

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