Stroncij
38
Sr
Skupina
2
Perioda
5
Blok
s
Protoni
Elektroni
Nevtroni
38
38
50
Splošne lastnosti
Vrstno število
38
Atomska teža
87,62
Masno število
88
Kategorija
Zemljoalkalijske kovine
Barva
Srebrna
Radioaktivno
Ne
Named after Strontian, a town in Scotland
Kristalna struktura
Ploskovno centrirana kubična
Zgodovina
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.
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.
Elektroni po lupinah
2, 8, 18, 8, 2
Razporeditev elektronov
[Kr] 5s2
Strontium metal turns yellow when exposed to air
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
2,64 g/cm3
Tališče
1050,15 K | 777 °C | 1430,6 °F
Vrelišče
1655,15 K | 1382 °C | 2519,6 °F
Talilna toplota
8 kJ/mol
Izparilna toplota
137 kJ/mol
Toplotna kapaciteta
0,301 J/g·K
Zastopanost v Zemljini skorji
0,036%
Zastopanost v vesolju
4×10-6%
Zasluge za slike: Wikimedia Commons (Alchemist-hp)
The chemical element strontium as a synthetic made crystals, sealed under argon in a glas ampoule
CAS številka
7440-24-6
PubChem CID številka
5359327
Atomske lastnosti
Atomski polmer
215 pm
Kovalentni polmer
195 pm
Elektronegativnost
0,95 (Paulingova lestvica)
Ionizacijski potencial
5,6949 eV
Atomski volumen
33,7 cm3/mol
Toplotna prevodnost
0,353 W/cm·K
Oksidacijska stanja
1, 2
Uporabe
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 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
Izotopi
Stabilni izotopi
84Sr, 86Sr, 87Sr, 88SrNestabilni izotopi
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