Chemistry
The atomic number of an element is more important to the chemist than its relative atomic mass. Why?
Periodic Table
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Answer
Through an experiment, Henry Moseley found that number of positive charge present in the nucleus of an atom or atomic number is the most fundamental property of an atom.
According to him, if elements are arranged in order of their increasing atomic number, those with similar properties are repeated after regular intervals, i.e., periodicity in the periodic table occurs based on the atomic numbers (number of protons). Hence, the atomic number is more important to a chemist than its relative atomic mass.
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