Mustaqillik yillarida mamlakatimizda hukumatimiz tomonidan ta’lim sohasiga eng muhim vazifa sifatida e’tibor qaratib kelinayotgani sir emas. Bu sohada qator islohotlar qabul qilindi

Nazorat ishining bali _________


II variant
1. Mg, Си, P, O₂ elementlarini energetik pog‘onachalarda elektronlarining taqsimlanishini yozing.
2. Natriy metalini davriy sistemada tutgan o‘rniga qarab unga ta’rif bering.
3.Quyidagi o‘zgarishlarni amalga oshirish uchun zarur bolgan tajribalarni bajaring va reaksiya tenglamalarini yozing.
Fe → FeSO₄ → Fe(OH )₂ → FeO →Fe.
4. Natriy sulfat tuzining 7,1% li 200 g eritmasiga mol miqdor bariy xlorid eritmasi quyilganda hosil bolgan cho‘kmaning massasini toping.
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