Surxondaryo viloyati boysun tumani 7-umumta’lim maktabining – “A

Nazorat shakli: Yozma ish.

1.Quyidagi formulalarni valentlik asosida tuzing :

II CuO III CrO VII ClO AlO I HgO KO III NH
IVCO II H S VI SO
2. Xlorning valentligi besh ekanligini bilgan holda uning kislorod bilan hosil qilgan birikmasining formulasini yozing.
3. Quyidagi moddalarning proton,neytron va elektronlarini aniqlang:
a) NH­₃ b) O₂ c) Si D) CO_­2
4. ⁸⁸Sr izotopi atomining yadrosini necha foizi neytronlardan iborat.
5. Xlorningvalentligibir, kislorodningvalentligiikkiekanliginibilganholdaformulalari FeCl₂, AlCl₃, LiCl, K₂O, MgO, Cr₂O₃, CrO₃, CrO, Mn₂O₇, MnO₂bo‘lganbirikmalardagiikkinchielementlarningvalentliginianiqlang.
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