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

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Solution

Elements in the periodic table are arrange by atomic number (number of protons) because various isotopes of elements exist with different atomic masses.

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Similar questions

Q. Define the Modern Periodic law. Why was it necessary to change the basis of classification from the atomic mass to the atomic number?

How did atomic number prove a better basis for the classification of elements?

Q. Atomic number is considered to be a more appropriate parameter than atomic mass for the classification of elements in a periodic table. Why?
How does atomic size of elements vary on moving from:
(i) left to right in a period?
(ii) top to bottom in a group?
Give reasons for your answers.

The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is :

(a) electron (b) proton (c) neutron (d) meson

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