Question

________ is a fundamental particle of an atom having mass almost equal to hydrogen atom.

Answer 1

• The existence of a neutral particle in the nucleus of an atom was discovered by James Chadwick.
• These particles are known as Neutrons.
• Neutron is a fundamental particle of an atom having no charge and it has a mass almost equal to a hydrogen atom$(1.675\times {10}^{-31}\mathrm{kg})$.

Hence, Neutron is a fundamental particle of an atom having a mass almost equal to a hydrogen atom.