Question

The change over from Mendeleev to modern periodic table was necessary because??​

Answer 1

Explanation:

1.In Mendeleev's periodic table elements were arranged accaording to their atomic masses,

the whole masses of nickel and cobalt was same therefore there was mistake regarding their position.

2.Isomers have same atomic number but different atomic masses so their was no space to place them in Mendeleev's periodic table.

Due to above reasons the change over from Mendeleev to modern periodic table was necessary.

Answer 2

Answer:

here is your answer mate

Explanation:

In the modern periodic table, the elements are arranged in the increasing order of their atomic number. Change in the basis of classification from atomic mass to the atomic number was required because : ... 3) Thus the properties of different elements can be compared if we know their atomic numbers.

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