Rubidij

37
Rb
Skupina
1
Perioda
5
Blok
s
Protons
Electrons
Neutrons
37
37
48
General Properties
Vrstno število
37
Atomska teža
85,4678
Mass Number
85
Kategorija
Alkalijske kovine
Barva
Silver
Radioactive
Ne
From the Latin word rubidus, deepest red
Kristalna struktura
Telesno centrirana kubična
Zgodovina
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.
Electrons per shell
2, 8, 18, 8, 1
Razporeditev elektronov
[Kr] 5s1
Rb
Rubidium burns with a reddish-violet flame color
Physical Properties
Faza snovi
Trdnina
Gostota
1,532 g/cm3
Tališče
312,46 K | 39,31 °C | 102,76 °F
Vrelišče
961,15 K | 688 °C | 1270,4 °F
Talilna toplota
2,19 kJ/mol
Izparilna toplota
72 kJ/mol
Toplotna kapaciteta
0,363 J/g·K
Abundance in Earth's crust
0,006%
Abundance in Universe
1×10-6%
Rubidium
Zasluge za slike: Wikimedia Commons (Dnn87)
Rubidium metal sample from the Dennis s.k collection
CAS Number
7440-17-7
PubChem CID Number
5357696
Atomic Properties
Atomski polmer
248 pm
Kovalentni polmer
220 pm
Elektronegativnost
0,82 (Paulingova lestvica)
Ionization Potential
4,1771 eV
Atomic Volume
55,9 cm3/mol
Toplotna prevodnost
0,582 W/cm·K
Oksidacijska stanja
-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
Isotopes
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