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Старый печатный экземпляр таблицы Менделеева 1885-го года. Найден при уборке в хранилище документов.

В таблице немало пропусков. В то время, очевидно, были открыты далеко не все элементы.

Нет гелия, да и атомные номера отсутствуют, инертных газов тоже нет. В пятом ряду между галлием и мышьяком стоит нарисованный знак вопроса, но атомная масса при этом правильная.



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Старый печатный экземпляр таблицы Менделеева 1885-го года. Найден при уборке в хранилище документов.

В таблице немало пропусков. В то время, очевидно, были открыты далеко не все элементы.

Нет гелия, да и атомные номера отсутствуют, инертных газов тоже нет. В пятом ряду между галлием и мышьяком стоит нарисованный знак вопроса, но атомная масса при этом правильная.

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