Which particle has the highest charge-to-mass ratio?
Electron has the highest e/m ratio due to its small mass.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Discovery of Subatomic Particles - Electron Proton Neutron
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The charge-to-mass ratio of an electron is determined to be 1.758820 × 10¹¹ C kg⁻¹. If the charge on an electron is -1.6
mₑ = e/(e/mₑ) = 9.1094×10⁻³¹ kg.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum