Ncert Exercises & Solutions

Which of the following statements about the electron is incorrect?

1.	It is a negatively charged particle.
2.	The mass of electron is equal to the mass of neutron.
3.	It is a basic constituent of all atoms.
4.	It is a constituent of cathode rays.

Hint: Mass of electron is different ffrom mass of neutron

The mass of the electron is very small as compared to the mass of the neutron.

Mass of electron

= 9.1 \times 10^{- 31} kg

Mass of neutron

= 1.67 \times 10^{- 27} kg