Question

The mass of the electrons is negligible when compared to protons.

• A. True
• B. False

Answer 1

The correct option is A True

Atoms have electrons, protons, and neutrons as the fundamental particles.
$$\begin{array}{cc}\text{Subatomic particle}& \text{Mass (kg)}\\ \text{Proton}& \text{1.67262178}\times {10}^{-27}\\ \text{Neutron}& \text{1.6749}\times {10}^{-27}\\ \text{Electron}& \text{9.10938291}\times {10}^{-31}\end{array}$$

$\frac{Massofproton}{Massofelectron}$= $\frac{1.67262178\times {10}^{-27}}{9.10938291\times {10}^{-31}}$ = 1840
Thus, mass of electron is $\frac{1}{1840}$, i.e., 0.0005 times that of proton.

Hence, the mass of an electron is negligible when compared to the mass of proton.