MCQ : From the fact then a helium atom is four times as heavy as a hydrogen atom

Question

From the fact then a helium atom is four times as heavy as a hydrogen atom. Rutherford predicted the existence of

1. proton
2. isotope
3. neutron
4. nucleus

Answer

neutron

Explanation

From the fact that a helium atom is four times as heavy as a hydrogen atom, Rutherford predicted the existence of a neutral particle in the nucleus, which he called a neutron. The neutron was later discovered by James Chadwick in 1932.