Strontium
38
Sr
Gruppe
2
Periode
5
Blokk
s
Proton
Elektron
Nøytron
38
38
50
Generelle eigenskapar
Atomnummer
38
Atommasse
87,62
Massetal
88
Kategori
Jordalkalimetall
Farge
Sølv
Radioaktiv
Nei
Named after Strontian, a town in Scotland
Krystallstruktur
Flatesentrert kubisk
Historie
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.
Elektron per energinivå
2, 8, 18, 8, 2
Elektronkonfigurasjon
[Kr] 5s2
Strontium metal turns yellow when exposed to air
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
2,64 g/cm3
Smeltepunkt
1050,15 K | 777 °C | 1430,6 °F
Kokepunkt
1655,15 K | 1382 °C | 2519,6 °F
Smeltevarme
8 kJ/mol
Fordampingsvarme
137 kJ/mol
Spesifikk varmekapasitet
0,301 J/g·K
Førekomst i jordskorpa
0,036%
Førekomst i universet
4×10-6%
Biletkreditering: 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-nummer
5359327
Atom eigenskapar
Atomradius
215 pm
Kovalent radius
195 pm
Elektronegativitet
0,95 (Paulings skala)
Ioniseringspotensial
5,6949 eV
Molart volum
33,7 cm3/mol
Termisk konduktivitet
0,353 W/cm·K
Oksidasjonstrinn
1, 2
Bruksområde
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
Isotopar
Stabile isotopar
84Sr, 86Sr, 87Sr, 88SrUstabile isotopar
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