Which of the following statements is TRUE?
(A) atoms contain equal numbers of protons and neutrons
(B) the mass of an atom is equal to the number of protons + the number of electrons
(C) neutrons have a mass of 0 and a charge of 1
(D) to calculate the number of neutrons in an atom, use the mass in the periodic table
(E) the atomic number is the number of electrons in an atom
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