Q. Consider the following statements regarding neutrons:
1.J. Chadwick discovered the sub atomic particle called as neutron.
2.Neutrons are present in the nucleus of all atoms, except hydrogen.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: C
Notes:

Explanation: In 1932, J. Chadwick discovered another sub atomic particle which had no charge and a mass nearly equal to that of a proton. It was eventually named as neutron.

  • Neutrons are present in the nucleus of all atoms, except hydrogen. In general, a neutron is represented as ‘n’.
  • The mass of an atom is therefore given by the sum of the masses of protons and neutrons present in the nucleus.

Source: Science NCERT