State two main properties of elements on which Mendeleev periodic classification was based . Why could no fixed position be assigned to hydrogen in his periodic table ?
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atomic mass and chemical properties
hydrogen exhibits properties of an alkali as well as halogens of group vii a
hydrogen exhibits properties of an alkali as well as halogens of group vii a
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Mendeleev's periodic law predicted the existence of some elements that had not been discovered at that time.
Mandeleev's periodic table could predict the properties of several elements on the basis of their position in the periodic table
Mandeleev's periodic table could predict the properties of several elements on the basis of their position in the periodic table
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