a) Which atom contains only two fundamental particles? b) Which particle has constant charge to mass ratio for all matter?

a) It's hydrogen, which only contains 1 proton and 1 electron .
There is no electron present in hydrogen , as Its atomic mass is 1 ( i.e. proton + neutron = 1 )


b)Cathode ray particles i.e., electrons, have constant charge to mass ratio for all matter.
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Hydrogen is the only atom that contains only two fundamental particles
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