Answer: (A) protons and neutrons both have a mass of 1 amu and are found in the nucleus. However, protons have a charge of positive 1, and neutrons are uncharged. Electrons have a mass of approximately 0 amu, orbit the nucleus, and have a charge of negative 1.
(B) The number of electrons, in turn, determines the chemical properties of the atom. Protons contribute to the mass of an atom and provide the positive charge to the nucleus. The number of protons also determines the identity of the element. Electrons have a negative charge
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