Stroncij
38
Sr
Skupina
2
Perioda
5
Blok
s
Protons
Electrons
Neutrons
38
38
50
General Properties
Vrstno število
38
Atomska teža
87,62
Mass Number
88
Kategorija
Zemljoalkalijske kovine
Barva
Silver
Radioactive
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.
Electrons per shell
2, 8, 18, 8, 2
Razporeditev elektronov
[Kr] 5s2
Strontium metal turns yellow when exposed to air
Physical Properties
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
Abundance in Earth's crust
0,036%
Abundance in Universe
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 Number
7440-24-6
PubChem CID Number
5359327
Atomic Properties
Atomski polmer
215 pm
Kovalentni polmer
195 pm
Elektronegativnost
0,95 (Paulingova lestvica)
Ionization Potential
5,6949 eV
Atomic Volume
33,7 cm3/mol
Toplotna prevodnost
0,353 W/cm·K
Oksidacijska stanja
1, 2
Applications
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
Isotopes
Stable Isotopes
84Sr, 86Sr, 87Sr, 88SrUnstable Isotopes
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