If an atom has 5 protons, 5 neutrons, and 3 electrons, what is the atom's charge?
a. +2
b. -2
c. 0
d.-3 can someone explain to me how to find the answer to this promblem

The answer is letter A. +2 since the difference between the no. of protons and no. of electrons is 2.

Strictly speaking what you are talking about is an ion - that is an atom which has lost some of its electrons. In a neutral atom there will be an equal number of electrons & protons. 

Electrons and protons have equal and opposite charges whose magnitude is 1.60*10^-19 C. Since your ion has 2 more protons than electrons, the net charge will be 2*1.60*10^-19 = 3.2*10^-19C This will be a positive charge

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