మూస:Infobox rubidium

రుబీడియం, ₀₀Rb

రుబీడియం
Pronunciation	/ruːˈbɪdiəm/ ​(roo-BID-ee-əm)
Appearance	grey white
Standard atomic weight Ar°(Rb)
	85.4678±0.0003 85.468±0.001 (abridged)
రుబీడియం 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 K ↑ Rb ↓ Cs క్రిప్టాన్ ← రుబీడియం → స్ట్రాన్షియం
Group	మూస:Infobox element/symbol-to-group/format
Period	period 5
Block	s-block
Electron configuration	[Kr] 5s1
Electrons per shell	2, 8, 18, 8, 1
Physical properties
Phase at STP	solid
Melting point	312.45 K ​(39.30 °C, ​102.74 °F)
Boiling point	961 K ​(688 °C, ​1270 °F)
Density (near r.t.)	1.532 g/cm3
when liquid (at m.p.)	1.46 g/cm3
Triple point	312.41 K, ​ kPa
Critical point	(extrapolated) 2093 K, 16 MPa
Heat of fusion	2.19 kJ/mol
Heat of vaporization	75.77 kJ/mol
Molar heat capacity	31.060 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 434 486 552 641 769 958
Atomic properties
Oxidation states	−1, +1 (a strongly basic oxide)
Electronegativity	Pauling scale: 0.82
Atomic radius	empirical: 248 pm
Covalent radius	220±9 pm
Van der Waals radius	303 pm
Spectral lines of రుబీడియం
Other properties
Natural occurrence	primordial
Crystal structure	​body-centered cubic (bcc)
Speed of sound thin rod	1300 m/s (at 20 °C)
Thermal conductivity	58.2 W/(m⋅K)
Electrical resistivity	128 n Ω⋅m (at 20 °C)
Magnetic ordering	paramagnetic
Young's modulus	2.4 GPa
Bulk modulus	2.5 GPa
Mohs hardness	0.3
Brinell hardness	0.216 MPa
CAS Number	7440-17-7
History
Discovery	Robert Bunsen and Gustav Kirchhoff (1861)
First isolation	George de Hevesy
Isotopes of రుబీడియం

References

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