Stronsium

38
Sr
Groep
2
Periode
5
Blok
s
Protrone
Elektrone
Neutrone
38
38
50
Algemene Eienskappe
Atoom Nommer
38
Atoommassa
87,62
Massa Nommer
88
Kategorie
Aardalkalimetale
Kleur
Silver
Radioaktief
Nee
Named after Strontian, a town in Scotland
Kristalstruktuur
Gesiggesentreerde kubieke
Geskiendenis
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.
Elektrone per skil
2, 8, 18, 8, 2
Elektronkonfigurasie
[Kr] 5s2
Sr
Strontium metal turns yellow when exposed to air
Fisiese Eienskappe
Fase
Soliede
Digtheid
2,64 g/cm3
Smeltpunt
1050,15 K | 777 °C | 1430,6 °F
Kookpunt
1655,15 K | 1382 °C | 2519,6 °F
Heat of Fusion
8 kJ/mol
Heat of Vaporization
137 kJ/mol
Spesifieke Hitte Kapasiteit
0,301 J/g·K
Oorvloed in die aardkors
0,036%
Oorvloed in die heelal
4×10-6%
The
Beeld Krediete: Wikimedia Commons (Alchemist-hp)
The chemical element strontium as a synthetic made crystals, sealed under argon in a glas ampoule
CAS Nommer
7440-24-6
PubChem CID Nommer
5359327
Atomiese Eienskappe
Atoom radius
215 pm
Kovalente Radius
195 pm
Elektronegatiewiteit
0,95 (Pauling scale)
Ionisasie potensiaal
5,6949 eV
Atoom volume
33,7 cm3/mol
Termiese geleidingsvermoë
0,353 W/cm·K
Oksidasiestate
1, 2
Toepassings
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
Stabiele Isotope
84Sr, 86Sr, 87Sr, 88Sr
Onstabiele 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