Question

Why the atomic number is considered more important than atomic mass of the element.

Answer 1

because it is used in modern periodic table and modern periodic states that atomic number must be used to classify elements...

Answer 2

Hey mate______

Here is your answer-__
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Because Properties of elements are periodic functions of their atomic number.

As we know the modern periodic table is made by Henry Mosley.

In 1913, the english scientist Henry Mosley demonstrated the atomic number of elements are more fundamental property than its atomic masses.

Hope helpful _____