2. Stabileste valenta elementului dupa formulele substantelor.
3. Alcatuieste formulele substantelor dupa valenta
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Răspuns:
2
NH3
N³H¹
PH3
P³H¹
CH4
C⁴H¹
CO2
C⁴O²
Al2O3
Al³O²
P2O3
P³O²
3
a) H2O
b) CO2
c) H2S
d) N2O