January 2023 1 23 Report
ДАЮ 47 БАЛІВ!!
1. Визначити валентність елементів у сполуках
Na 2 O ; BaCl 2 ; NO ; CH 4 ; K 2 S ; NO 2 .
2. Скласти формули сполук:
Fe(II)Cl, P(V)Cl, CaCl, BaS, C(II)O, AlO .
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