(i) It is a negatively charged particle.
(ii) The mass of an electron is equal to the mass of a neutron.
(iii) It is a basic constituent of all atoms.
(iv) It is a constituent of cathode rays.
Correct Answer: (ii) The mass of an electron is equal to the mass of a neutron
Explanation: Mass of an electron is 200 times smaller than the mass of a neutron