Who was the first to propose the idea of atomic number?

Who was the first to propose the idea of atomic number?

  • Henry Moseley
  • Dmitri Mendeleev
  • Ernest Rutherford
  • John Dalton
The correct option is: Henry Moseley
The concept of atomic number was first proposed by Henry Moseley in 1913, based on his X-ray spectra experiments.
Tags: atomic numberHenry Moseleyperiodic table