Strontium

38
Sr
Grupp
2
Period
5
Block
s
Protoner
Electrons
Neutroner
38
38
50
Generella Egenskaper
Atomnummer
38
Atommassa
87,62
Mass Number
88
Kategori
Alkaliska jordmetaller
Färg
Silver
Radioaktiv
Nej
Named after Strontian, a town in Scotland
Kristallstruktur
Ytcentrerat kubiskt
Historia
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.
Elektroner per skal
2, 8, 18, 8, 2
Elektronkonfiguration
[Kr] 5s2
Sr
Strontium metal turns yellow when exposed to air
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
2,64 g/cm3
Smältpunkt
1050,15 K | 777 °C | 1430,6 °F
Kokpunkt
1655,15 K | 1382 °C | 2519,6 °F
Smältvärme
8 kJ/mol
Ångbildningsvärme
137 kJ/mol
Specifik värmekapacitet
0,301 J/g·K
Abundance in Earth's crust
0,036%
Abundance in Universe
4×10-6%
The
Bildkrediter: 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
Atomära Egenskaper
Atomradie
215 pm
Kovalent radie
195 pm
Elektronegativitet
0,95 (Paulingskalan)
Jonisationspotential
5,6949 eV
Molvolym
33,7 cm3/mol
Värmeledningsförmåga
0,353 W/cm·K
Oxidationstillstånd
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's non-radioactive isotopes are considered non-toxic
Isotoper
Stabila isotoper
84Sr, 86Sr, 87Sr, 88Sr
Instabila isotoper
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