Question

Two drawbacks of mendeleev periodic table

Answer 1

HEY DEAR.....!!

(1) POSTION OF HYDORGEN : hydrogen is placed in group l-A of the periodic table. however, it resembles the elements of both group I A and group VII A .Therefore, the position of hydrogen I'd not clear.

(2) METALS AND NON- METALS : non. attempt has been made to place metals and non - metals separately in it..


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Answer 2

when he started trying to write the periodic table only 63 elements were known. he given the relationship between the atomic masses and physics chemical properties . position of hydrogen , oxygen and isotopes were placed wrong .some anomalous series were corrected later for Te, I . he took wrong atomic masses of Be, Mg , Ca