Toshkent viloyati quyi chirchiq tumani maktabining 7 – “ ” sinf o`quvchisi

2-Nazorat ishi:
Mavzu:

Atom. Atom tuzilishi haqidagi bilimlarning rivojlanish tarixi

Atom va uning tuzilishi, proton, neytron va elektronlar

Kimyoviy element. Kimyoviy belgi

Kimyoviy elementning nisbiy atom massasi

Izotoplar. Izobarlar. Izotonlar

Kimyoviy formula. Valentlik

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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