How have scientists calculated atomic numbers and atomic masses of elements - Science - Structure of the Atom

Question

How have scientists calculated atomic numbers and atomic masses of
elements?

Kushal Kumar · Accepted Answer

Dear Student
Atomic numbers were calculated using the number of protons in an
atom Atomic number= Number of protons in atom* Mass of 1 proton
Atomic mass=Number of protons*mass of 1 proton+Number of neutrons
in atom* mass of 1 neutron
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How have scientists calculated atomic numbers and atomic masses of elements?