Strontium
38
Sr
Groep
2
Periode
5
Blok
s
Protonen
Elektronen
Neutronen
38
38
50
Algemene Eigenschappen
Atoomnummer
38
Atomair gewicht
87,62
Massa Getal
88
Categorie
Aardalkalimetalen
Kleur
Zilver
Radioactief
Nee
Vernoemd naar Strontian, een dorp in Schotland
Kristalstructuur
Zijvlak-gecentreerde Kubus
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.
Eletronen per schil
2, 8, 18, 8, 2
Electronconfiguratie
[Kr] 5s2
Strontium metal turns yellow when exposed to air
Fysieke Eigenschappen
Fase
Vast
Dichtheid
2,64 g/cm3
Smeltpunt
1050,15 K | 777 °C | 1430,6 °F
Kookpunt
1655,15 K | 1382 °C | 2519,6 °F
Fusiewarmte
8 kJ/mol
Verdampingswarmte
137 kJ/mol
Specifieke Warmtecapaciteit
0,301 J/g·K
Overvloedig aanwezig in de aardkorst
0,036%
Overvloedig aanwezig in het universum
4×10-6%
Verdiensten voor afbeeldingen: 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
Atoomeigenschappen
Atoomstraal
215 pm
Covalentiestraal
195 pm
Electronegativiteit
0,95 (Pauling schaal)
Ionisatiepotentiaal
5,6949 eV
Atoomvolume
33,7 cm3/mol
Thermische geleiding
0,353 W/cm·K
Oxidatietoestanden
1, 2
Toepassingen
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
Isotopen
Stabiele isotopen
84Sr, 86Sr, 87Sr, 88SrInstabiele isotopen
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