Question

write merits of mandelleves periodic table
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Answer 1

he could predict the elements which was not discover on that time

he could also left the blankes for the isotopes
which was not discover on that time

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Answer 2

There are three merits of mendelleves preodic table that are as follow..

1) he didn't gives the position of hydrogen

2) isotopes posed a challenge to mendelleve

3) he took two unlike elements in same box

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