Compare the mass and charge on an electron and a proton.

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Solution

An electron has the same magnitude of charge as a proton. However, its mass is much smaller than that of a proton.

Mass of an electron, $m_{e} = 9.1 \times 10^{- 31} k g$
Mass of a proton, $m_{p} = 1.672 \times 10^{- 27} k g$

Charge on an electron, $q_{e} = - 1.6 \times 10^{- 19} C$
Charge on a proton, $q_{p} = 1.6 \times 10^{- 19} C$

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