Lantaan (sümbol La) on keemiline element järjekorranumbriga 57, haruldane muldmetall.
57 | 2 9 18 18 8 2 |
La 138,91 | |
Lantaan |
Lantaanil on üks stabiilne isotoop massiarvuga 139. Ka esineb looduses üks radioaktiivne isotoop massiarvuga 138, mille poolestusaeg on 105 miljardit aastat.
Omadustelt on lantaan lantanoid. Selle tihedus normaaltingimustel on 6,15 g/cm³ ja sulamistemperatuur on 820 Celsiuse kraadi.
Vikisõnastiku artikkel: lantaan |
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