Question

Which subatomic particles have approximately the same mass?

• A. Protons and electrons
• B. Protons and neutrons
• C. Electrons and neutrons
• D. Electrons and nucleons

Answer 1

The correct option is B Protons and neutrons

The masses of the subatomic particles are given below. $$\begin{array}{cc}\text{Subatomic particle}& \text{Mass (kg)}\\ \text{Proton}& \text{1.6726}\times {10}^{-27}\\ \text{Neutron}& \text{1.6749}\times {10}^{-27}\\ \text{Electron}& \text{9.1093}\times {10}^{-31}\end{array}$$
The mass of a proton is nearly same as the mass of a neutron, whereas the mass of an electron is nearly $\left(\frac{1}{1836}\right)$times that of the proton.