Question

Write two criteria. Did mendeleev use to ckassify the elements in his periodic table? Why no fixed position could be given to. Hidrogen in mendeleev s periodic table

Answer 1

classify he classified the elements in his periodic table ...hydrogen could not be given fixed position because at resembles the properties of 1st group as well as 17th group

Answer 2

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Mandeleev used some of the criteria for classifying the elements in his periodic table .

Two criterion are :-


# He classified the elements on the basis of the reaction of elements with oxygen .



# He also used the criteria of increasing atomic mass .




Now coming to second question .


>> Hydrogen resembles the character of alkali metals as well as the halogens . So , he was unable to give hydrogen a fixed position .



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