Why was the basis of classification of elements changed from the atomic mass to the atomicnumber?

Why was the basis of classification of elements changed from the atomi

1.	Why was the basis of classification of elements changed from the atomic mass to the atomicnumber?
Answer» Because atomic NUMBER is more FUNDAMENTAL than mass number properties of elements are more SORTED in atomic number elements can be arranged into periods and groups more easily

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Why was the basis of classification of elements changed from the atomic mass to the atomicnumber?

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