Question

which of the following correctly describes a proton?
a it has an electrical charge of +2.
b it has a mass of 1 mg.
c it has a diameter of 1.7 × 10^{-27} km.
d none of the above

Explanation:

A proton has an electrical charge of +1, not +2. Its mass is approximately \(1.67\times10^{-27}\) kg (not 1 mg which is \(1\times10^{-6}\) kg). The diameter of a proton is on the order of \(10^{-15}\) meters (not \(1.7\times10^{-27}\) km). So none of the options a, b, or c are correct.

Answer:

d. none of the above