What is the magnitude of the charge of an electron, and which of the following options correctly represents it?

The charge of a single electron is a fundamental constant in physics, known as the elementary charge. Its magnitude is approximately $1.602 \times 10^{-19}$ Coulombs (C).

• Option A: $1.6 \times 10^{-19} \text{ C}$
• Option B: $1.6 \times 10^{19} \text{ C}$ (The exponent is positive, which is incorrect for an electron's charge magnitude.)
• Option C: $9.1 \times 10^{-31} \text{ C}$ (This value is the approximate mass of an electron, not its charge, and the unit is incorrect for mass.)
• Option D: $9.1 \times 10^{31} \text{ C}$ (This value and exponent are incorrect.)

The correct magnitude for the charge on an electron is given by option A.

The final answer is $\text{A) } 1.6 \times 10^{-19} \text{ C}$.