Elemente si combinatii chimice
Elemente si combinatii chimice
Elemente si combinatii chimice
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•<br />
Hydrogen have three isotopes : protium,<br />
deuterium, and tritium: 1<br />
1 H, 2<br />
1 H (noted D) şi 3<br />
1 H<br />
(noted T). Of course the mass of D is twice of<br />
the mass of protium and the mass of tritium is<br />
three times than of protium. 99.985% from<br />
crust’s hydrogen is protium and only 0.015% is<br />
deuterium. This is the reason for which the<br />
atomic mass of the hydrogen is fractional<br />
(1.008). Heaviest isotope - tritium - is β- radioactive, having the halving time T1/2 = 12.26<br />
years, pas<strong>si</strong>ng to helium. It can be used without<br />
danger as radioactive tracer – shows the<br />
manner in which a succes<strong>si</strong>on of chemical<br />
reactions or technological stages are deployed.
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