Question

why was basis of classification of element changed from the atomic mass to the atomic number​

Answer 1

Answer:

the answer is quiet simple

Explanation:

the classification of elements changed from the atomic mass to atomic number becoz sometimes the atomic masses would be same but the atomic number were never same and it was very difficult to arrange in terms of atomic masses because if the two elements had the same mass then it would be a big problem to arrange

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Answer 2

Answer:

Modern Periodic Law:

The physical and chemical properties of elements are the periodic functions o of their atomic number.

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 :

1) The atomic mass can in no way determine the chemical properties of elements because it does not vary regularly with gradation in the chemical properties of elements.

2) The chemical properties of the elements depend upon the number of electrons in the valence shell which is related to the atomic number.

3) Thus the properties of different elements can be compared if we know their atomic numbers.

so the adjustments were made to the Mendeleev's periodic table (which was classified based on the atomic mass of the elements) and the modern periodic table(which is classified based on the atomic numbers of the elements ) was prepared.