Chemistry
Senior High
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(6)と(7)がそれぞれⅡ価とⅢ価の硫化鉄なんですけど
どうやったらⅡ価とⅢ価を見分けられますか??

次の組成式で示される物質の名称 (1) KCI (2) NaOH ( (6) FeSO4 (7) Fe2 (SO4)3 次の各原子の電子式を記せ。

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