Rubidium

37
Rb
Gruppe
1
Periode
5
Blok
s
Protons
Electrons
Neutrons
37
37
48
General Properties
Atomnummer
37
Atommasse
85,4678
Mass Number
85
Kategori
Alkalimetaller
Farve
Silver
Radioactive
Nej
From the Latin word rubidus, deepest red
Krystalstruktur
Rumcentreret Kubisk
History
German chemists Robert Bunsen and Gustav Kirchhoff discovered rubidium in 1861 by the newly developed method of flame spectroscopy.

The separation of the metal was tried by Bunsen, but he never got samples with more than 18% of Rubidium.

The separation of the metal was only accomplished by George de Hevesy, through the hydrolysis of melted rubidium hydroxide.
Elektroner i hver skal
2, 8, 18, 8, 1
Elektronkonfiguration
[Kr] 5s1
Rb
Rubidium burns with a reddish-violet flame color
Physical Properties
Tilstandsform
Fast stof
Massefylde
1,532 g/cm3
Smeltepunkt
312,46 K | 39,31 °C | 102,76 °F
Kogepunkt
961,15 K | 688 °C | 1270,4 °F
Smeltevarme
2,19 kJ/mol
Fordampningsvarme
72 kJ/mol
Varmefylde
0,363 J/g·K
Abundance in Earth's crust
0,006%
Abundance in Universe
1×10-6%
Rubidium
Billede akkrediteringer: Wikimedia Commons (Dnn87)
Rubidium metal sample from the Dennis s.k collection
CAS Number
7440-17-7
PubChem CID Number
5357696
Atomic Properties
Atomradius
248 pm
Kovalent radius
220 pm
Elektronegativitet
0,82 (Paulings skala)
Ionization Potential
4,1771 eV
Atomic Volume
55,9 cm3/mol
Varmeledningsevne
0,582 W/cm·K
Oxidationstrin
-1, 1
Applications
Rubidium is used as a getter in vacuum tubes and as a photocell component.

Rubidium compounds are sometimes used in fireworks to give them a purple color.

Rubidium salts are used in glasses and ceramics.

Rubidium-87 is slightly radioactive and has been used extensively in dating rocks.
Rubidium is not known to be toxic
Isotoper
Stable Isotopes
85Rb
Unstable Isotopes
71Rb, 72Rb, 73Rb, 74Rb, 75Rb, 76Rb, 77Rb, 78Rb, 79Rb, 80Rb, 81Rb, 82Rb, 83Rb, 84Rb, 86Rb, 87Rb, 88Rb, 89Rb, 90Rb, 91Rb, 92Rb, 93Rb, 94Rb, 95Rb, 96Rb, 97Rb, 98Rb, 99Rb, 100Rb, 101Rb, 102Rb