Podaj wzór sumaryczny :
S (VI) O (II)
Na (I) O (II)
K (I) Cl (I)
Cu (II) Cl (II)
Mn (VII) O (II)
Os (VIII) O (II)
Al (III) O (II)
Zn (II) S (II)
H (I) S (II)
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1. SO₃
2. Na₂O
3. KCl
4. CuCl₂ (błąd w poleceniu - chlor w chlorkach jest zawsze 1-wartościowy)
5. Mn₂O₇
6. OsO₄
7. Al₂O₃
8. ZnS
9. H₂S