A 2.5 g copper penny is given a charge of 3.5 nC. Which statement best describes the numbers of protons and electrons in the penny when it is charged as indicated? Electrons were added, and the number of electrons exceeds the number of protons. There is insufficient information to compare the numbers of protons and electrons. Electrons were added, and the number of protons exceeds the number of electrons. Electrons were removed, and the number of protons exceeds the number of electrons. Electrons were removed, and the number of electrons exceeds the number of protons. The number of protons is equal to the number of electrons.