Electric Circuits
The mass of a neutron of atom is

 1.609 × 10 - 31 Kg.
 1.675 × 10 - 27 Kg.
 1.602 × 10 - 19 Kg.
 1.672 × 10 - 26 Kg.

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Electric Circuits
Atoms have no electric charge because they

 have an equal number of electrons and protons.
 have neutrons in their nuclei.
 have an equal number of charged and non charged particles.
 have an equal number of neutrons and protons.

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