Strontium

38
Sr
Gruppe
2
Periode
5
Block
s
Protonen
Elektronen
Neutronen
38
38
50
Generelle Eigenschaften
Ordnungszahl
38
Atommasse
87,62
Massenzahl
88
Kategorie
Erdalkalimetalle
Farbe
Silber
Radioaktiv
Nein
Benannt nach Strontian, einem Dorf in Schottland
Kristallstruktur
Kubisch flächenzentriert
Geschichte
Strontium was recognized as a new element in 1790 when Adair Crawford and his colleague William Cruickshank analyzed a mineral sample from a lead mine near Strontian, Scotland.

The element was eventually isolated by Sir Humphry Davy in 1808.

The isolation was done by the electrolysis of a mixture containing strontium chloride and mercuric oxide.
Elektronen pro Schale
2, 8, 18, 8, 2
Elektronenkonfiguration
[Kr] 5s2
Sr
Strontium metal turns yellow when exposed to air
Physikalische Eigenschaften
Aggregatzustand
Fest
Dichte
2,64 g/cm3
Schmelzpunkt
1050,15 K | 777 °C | 1430,6 °F
Siedepunkt
1655,15 K | 1382 °C | 2519,6 °F
Schmelzwärme
8 kJ/mol
Verdampfungswärme
137 kJ/mol
Spezifische Wärmekapazität
0,301 J/g·K
Häufigkeit in der Erdkruste
0,036%
Häufigkeit im Universum
4×10-6%
The
Danksagungen für Bilder: Wikimedia Commons (Alchemist-hp)
The chemical element strontium as a synthetic made crystals, sealed under argon in a glas ampoule
CAS-Nummer
7440-24-6
PubChem CID Number
5359327
Atomeigenschaften
Atomradius
215 pm
Kovalenter Radius
195 pm
Elektronegativität
0,95 (Pauling-Skala)
Ionisierungsenergie
5,6949 eV
Molares Volumen
33,7 cm3/mol
Wärmeleitfähigkeit
0,353 W/cm·K
Oxidationszustände
1, 2
Anwendung
The primary use for strontium is in glass for color television cathode ray tubes.

Strontium salts are used in flares and fireworks for a crimson color.

Strontium chloride is used in toothpaste for sensitive teeth.

Strontium oxide is used to improve the quality of pottery glazes.
Strontium's non-radioactive isotopes are considered non-toxic
Isotope
Stabile Isotope
84Sr, 86Sr, 87Sr, 88Sr
Instabile Isotope
73Sr, 74Sr, 75Sr, 76Sr, 77Sr, 78Sr, 79Sr, 80Sr, 81Sr, 82Sr, 83Sr, 85Sr, 89Sr, 90Sr, 91Sr, 92Sr, 93Sr, 94Sr, 95Sr, 96Sr, 97Sr, 98Sr, 99Sr, 100Sr, 101Sr, 102Sr, 103Sr, 104Sr, 105Sr