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Автор - anna2037

укажите значения валентности над знаками химических элементов AI2O3, SiH4, Mg2Si, Cl2O2

Ответ

Автор - 1234vangal1234

Al2(+3)O3(-2),Si(+4)H4(-1),Mg2(-1)Si(+2),Cl(+2)O2(-2)

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