Question

Two achievement if mendeleev's periodic classification

Answer 1

achievements of mendeleev's periodic table:

1. he could predict the properties of some elements which were not present at that time.

2. noble gases could be accomodated in a separate column.


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Answer 2

a) In mendleev periodic table he has leaved some spaces for the discovery of new elements and named them eka boron eka silicon and eka aluminium later they r named as germanium ,stanium etc
b) His table was on the basis of atomic masess
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