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Mendleev classified the elements and arrranged them in the form of a table.Hydrogen which resembles alkali metals and halagens,was placed in the first group. why?How does it resemble halogens?Why do you think he named it as periodic table? |
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Answer» ev considered FORMULAE of hydrides and OXIDES FORMED by an element as one of the basic PROPERTIES to classify the elements in his Periodic Table.HYDROGEN makes oxides similar to alkali metals, such as H2O (Hydrogen oxide i.e. water) and hydrides similar to halogen such as LiH (Lithium hydride), so it could be placed with halogens in the same group i.e. in VIIth group. But, hydrogen was placed with alkali metals in Ist group in Mendeleev's Periodic Table.It appears that hydrogen is placed as starting element in 1st period and Ist group in the Mendeleev's Periodic Table. Thus, I think it was the correct position as hydrogen has been placed the same position even in Modern Periodic table.Because.............The periodic table is an arrangement of the elements in order of their atomicnumbers so that elements with similar properties appear in the same vertical column or group..... |
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