37 85.468
Rb
Rubidium

Rubidium , Rb

Rubidium is a chemical element with the symbol Rb and atomic number 37. Rb is a soft, silvery-white metallic element of the alkali metal group. Rb-87, a naturally occurring isotope, is (slightly) radioactive. Rubidium is very soft and highly reactive, with properties similar to other elements in group 1, like rapid oxidation in air.

 

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R3-10000-P

RbC2H3O2 -4 mesh 99.9% Pure

Rubidium Acetate

R3-10002-P

Rb2CO3 -20 mesh 99.9% Pure

Rubidium Carbonate

R3-10003-P

RnCl -4 mesh 99.9% Pure

Rubidium Chloride

R3-10004-P

Rb2CrO4 -20 mesh 99.9% Pure

Rubidium Chromate

5.1 UN1479 PG III Oxidizer

R3-10005-P

RbF -4 mesh 99.9% Pure

Rubidium Fluoride

R3-10007-P

RbIO3 -4 mesh 99.9% Pure

Rubidium Iodate

5.1 UN1479 PG II Oxidizer

R3-10009-P

Rb2MoO4 -200 mesh 99.5% Pure

Rubidium Molybdate

R3-10010-P

RbNbO3 -200 mesh 99.5% Pure

Rubidium Niobate

R3-10011-P

RbNO3 -80 mesh 99.9% Pure

Rubidium Nitrate

5.1 UN1477 PG III Oxidizer

R3-10012-P

RbClO4 -4 mesh 99.9% Pure

Rubidium Perchlorate

5.1 UN1481 PG II Oxidizer

R3-10013-P

Rb2Se -60 mesh 99.5% Pure

Rubidium Selenide

4.3 UN1423 PG I Dangerous when wet

R3-10014-P

Rb2SO4 -20 mesh 99.9% Pure

Rubidium Sulphate

R3-10015-P

RbTaO3 -200 mesh 99.5% Pure

Rubidium Tantalate

R3-10016-P

Rb2TiO3 -200 mesh 99.5% Pure

Rubidium Titanate

R3-10017-P

Rb2WO4 -200 mesh 99.5% Pure

Rubidium Tungstate

R3-10018-P

RbVO3 (meta) -100 mesh 99.5% Pure

Rubidium vanadate

6.1 UN3288 PG II Toxic

R3-10019-P

Rb3V2O7 (pyro) -100 mesh 99.5% Pure

Rubidium vanadate

6.1 UN3288 PG II Toxic

R3-10020-P

Rb2CO3 -14 mesh 99.95% Pure

Rubidium Carbonate

Rubidium is the second most electropositive of the stable alkali elements and liquefies at high ambient temperature (102.7 °F = 39.3 °C). Like other group 1 elements this metal reacts violently in water. In common with potassium and caesium this reaction is usually vigorous enough to ignite the liberated hydrogen. Rubidium has also been reported to ignite spontaneously in air. Also like other alkali metals, it forms amalgams with mercury and it can form alloys with gold, caesium, sodium, and potassium. The element gives a reddish-violet color to a flame, hence its name.

Symbol Rb
Atomic number 37
No. of naturally occurring isotopes 1+1*
Atomic weight 85.4678(+/-3)
Electronic configuration [Kr]5s'
Metal radius/pm 248
Ionic radius(6-coordinate)/pm 152
E° (M+(aq)\ + e- →M(s))/V -2.93
Density (20°C)/gcm3 1.532
Melting point / °C 39
Boiling point / °C 688
ΔHfus/kJmol-1 2.2
ΔHvap/kJmol-1 76
ΔHf(monoatomic gas)/kJmol-1 88
ΔHdissoc/kJmol-1 47.3
Ionization energy/kJmol-1 402.9
* (radioactive 87Rb t½ 5.7x 1010y)
Temperature (oC) @Vap. Pressure
10-8 Torr -3
10-6 Torr 37
10-4 Torr 111
Techniques
Electron Beam -
Crucible Quartz
Coil -
Boat -
Remarks
-