Question

what was Mendeleev's contribution to the concept of periodic table which laid the foundation of modern periodic table?

Answer 1

actually mendeleev arranged all elements according to the atomic mass and he failed so modern periodic table arranged according to the atomic number

Answer 2

HEYA!!
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♠Mendeleev 's Periodic Table ♠
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〰He arranged the then known elements into a table . His basis of classification was :-

➡Increasing Atomic Masses

➡Grouping together of Elements having similar properties .

〰Vertical columns containing dissimilar property elements were called Groups . There were 8 Groups in his table .

〰Horizontal columns containing similar property elements were called Periods . There were 7 periods in his table .

〰He even left gaps in his periodic table for accommodating future discovered element's. he even predicted their properties by studying properties of neighboring elements.


➡So his classification laid down the basis of Modern periodic table

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