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Dida, you should know this that,
The electron is a very tiny particle. It has a mass of 9,11 × 10−31 kg. The electron carries one unit of negative electric charge (i.e. −1,6 × 10−19 C).
and the proton carries one unit of positive electric charge (i.e. +1,6 × 10−19 C).
And the main point to know is that the The neutron is electrically neutral i.e. it carries no charge at all. Like the proton, it is much heavier than the electron and its mass is 1,6749 × 10−27 kg (slightly heavier than the proton). 

thank you,
your friend Aku47,
nice to help you.
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