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Выпишите знаки химических элементов II группы

akopovaliza2003 akopovaliza2003    2   17.04.2019 03:10    1

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шрвлап шрвлап  17.04.2019 03:10
а) IIА-группа: Be, Mg, Ca, Sr, Ba, Ra
б) IIБ-группа: Zn, Cl, Hg
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