Предмет: Математика, автор: ivanbelosohov

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Автор ответа: Аноним
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\displaystyle 1\frac{17}{18}(3\frac{1}{4}-2,95):3,5=\frac{35}{18}(\frac{13}{4}-\frac{59}{20}):\frac{7}{2}=\frac{35}{18}*\frac{3}{10}*\frac{2}{7}=\frac{5}{6}*\frac{1}{5}=\frac{1}{6}

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THE PERIODIC TABLE OF D.I.MENDELEYEV
There are certain natural groupings among the chemical elements in which every element is closely related to 1 the other elements in its group. In order to understand better these groupings, chemists have tried to fit the elements into a single plan.
One of the earlier attempts to fit the relationships 2 among the elements into a single law was made by John Ncwlands in England, who suggested the Law of Octaves.
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Ответить на вопросы по тексту
Who developed the concept of the periodic repetition of properties?
What columns are there in the Periodic Table?
What did Mendeleyev predict?
What certain natural groupings are there among the chemical elements?
What have chemists tried to do in order to understand better these groupings?
Who made one of the first attempts to fit the relationships among the elements?

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