An atom has no electrical charge because
the number of protons is equal to the number of neutrons
the number of neutrons is equal to the number of electrons
the number of protons is equal to the number of electrons

C or the last choice.

Explanation:

The number of electrons (which have a minus charge) have the same charge as the number of protons (which have a plus charge) but opposite in sign as the protons.

So to take the very simplest example, hydrogen has 1 proton and 1 electron. The proton is 1+ and the electron is 1-. Together they cancel. No charge. If this were not true, everytime you picked something up if the charges were unbalanced, they would shock you to death literally.

The answer is the number of protons = the number of electrons. Neutons have nothing to do with it.

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