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J
josep Martínez Vilella
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Crom
1.
Presentació •
Nom: Crom • Símbol: Cr • Nombre atòmic: 24 • Estat a temperatura ambient: sòlid
2.
On el trobem
a la natura • En l’escorça terrestre hi ha un 0,02%. • El crom es troba en Rússia, Brasil, Estats Units i Tasmània.
3.
S'obté en substancia
pura • El crom s'obté en estat pur.
4.
Aplicacions • El crom
s'empra principalmente en metalurgia per a aportar resistència a la corrosio i un acabat brillant. En aliatges, per exemple, l‘hacer inoxidable que conté més d'un 8% en crom.
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