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