Chemistry, 21.10.2020 18:01, mimireds5419

1)Массовая доля хрома из H2Cr2O7 Два атома водорода, два атома хрома, семь атомов кислорода. 2)Дайте характеристику элементу фосфору на основании положения его в периодической системе по плану: символ элемента, порядковый номер, номе периода (тип периода), номер группы(тип подгруппы), металл или не металл, составьте схему строения атома. П НА СЕГОДН 10 БАЛЛООВ

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1)Массовая доля хрома из H2Cr2O7 Два атома водорода, два атома хрома, семь атомов кислорода. 2)Дайт...