The value of $e/m$ is maximum for which of the following?

Who discovered the charge of an electron? State the charge and mass of an electron.

Anode rays were discovered by

State whether the following statements are true or false:
$(i)$ Faraday's electrolysis experiments and cathode ray discharge tube experiments prove that protons are located in the nucleus of the atom,while electrons are located outside the nucleus.
$(ii)$ In the year $1887$,Goldstein discovered the proton.
$(iii)$ In the year $1932$,the neutron was discovered by Chadwick.
$(iv)$ The first atomic model was proposed by Thomson.

The neutrino has:

The mass to charge ratio $(m/e)$ of a cation is $1.5 \times 10^{-8} \ kg/C$. What is the mass of the ion?