Question

The atomic number of an element is a more fundamental property than its atomic mass was showed by

Answer 1

Answer:

Henry Moseley

Explanation:

He did an experiment using x-ray that showed, that the atomic number of an element corresponds to the positive charge on the nucleus or the number of protons in the nucleus of the atom of that element.

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Answer 2

Henry Moseley,the English scientist demonstrated with the help of experiment done using x-ray tube that atomic number of an element corresponds to the no. of protons or electrons in the nucleus of an atom of the elements.This revealed that atomic number is more fundamental property of an element than its atomic mass.

Accordingly The modern periodic law is,

"The properties of element are periodic function of their atomic numbers."