Question

merits and demerits of Mendeleev for std 10​

Answer 1

HEYA

merits of mandleev:-
●by his table some doubtful atomic mass were corrected. for ex-platinum
●he compared hydrites(reaction of hydrogen with an element) and oxide(reaction of oxygen with an element)in order to fit in a group..

●he predict the upcoming element with an sanskrit numerical called 'eca' .. for example:- eca boron, eca aluminium

●he doesn't leave gap for noble gas. he said that they will be created in another group without dsturbing the whole table
●it was a great systamic study of elements

demarits of mandleev:-

●he doesn't able to give a unique position to hydrogen.. as hydrogen resemble alkali metals in configuration but react with carbon as halogen

●isotops who have different atomic mass were absent in the table.

●he fitted some higher atomic masses element before slightly lower atomic mass element

hope it helps

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