Strontium

Kemiallinen merkki: Sr
Järjestysluku: 38
Kategoria: maa-alkalimetallit
Ryhmä: 2
Jakso: 5
Lohko: s
Moolimassa: 87,62 g/mol
Elektronia kuorilla: 2, 8, 18, 8, 2
CAS-numero: 7440-24-6
Olomuoto: kiinteä
Tiheys: 2,64 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1050 K (777 °C, 1431 °F)
Kiehumispiste: 1655 K (1382 °C, 2520 °F)
Kiderakenne: body centered cubic
Hapetusluvut: 2, 1
Elektronegatiivisuus: 0,95 (Pauling-asteikko)
Nimen alkuperä: Strontian
Nimen tarkoitus: is named after the Scottish village, having been discovered in the lead mines there
Faktoja:
- is a soft silver-white or yellowish metallic element that is highly reactive chemically
- occurs naturally in the minerals celestine and strontianite, but the strontium-90 isotope is present in radioactive fallout and has a half- life of 29
- the primary use for strontium compounds is in glass for colour television cathode ray tubes to prevent X-ray emission
- occurs commonly in nature
- in its pure form strontium is extremely reactive with air and spontaneously combusts