Rubidium

Rubidium, ₃₇Rb

Rubidium
Pípè	/ruːˈbɪdiəm/ ​(roo-BID-ee-əm)
Ìhànsójú	grey white
Ìwúwo átọ̀mù Ar, std(Rb)	85.4678(3)
Rubidium 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 K ↑ Rb ↓ Cs krypton ← rubidium → strontium
Nọ́mbà átọ̀mù (Z)	37
Ẹgbẹ́	group 1: H and alkali metals
Àyè	àyè 5
Àdìpọ̀	Àdìpọ̀-s
Ẹ̀ka ẹ́límẹ́ntì	Alkali metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Kr] 5s1
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 8, 1
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	312.46 K ​(39.31 °C, ​102.76 °F)
Ígbà ìhó	961 K ​(688 °C, ​1270 °F)
Kíki (near r.t.)	1.532 g/cm3
when liquid (at m.p.)	1.46 g/cm3
Critical point	(extrapolated) 2093 K, 16 MPa
Heat of fusion	2.19 kJ/mol
Heat of	75.77 kJ/mol
Molar heat capacity	31.060 J/(mol·K)
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 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 0.82
Atomic radius	empirical: 248 pm
Covalent radius	220±9 pm
Van der Waals radius	303 pm
Spectral lines of rubidium
Other properties
Natural occurrence	primordial
Crystal structure	​(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
Main isotopes of rubidium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 83Rb syn 86.2 d ε - 83Kr γ 0.52, 0.53, 0.55 - 84Rb syn 32.9 d ε - 84Kr β+ 1.66, 0.78 84Kr γ 0.881 - β− 0.892 84Sr 85Rb 72.168% 85Rb is stable with 48 neutrons 86Rb syn 18.65 d β− 1.775 86Sr γ 1.0767 - 87Rb 27.835% 4.88 × 1010 y β− 0.283 87Sr