The diagram shows the electron configuration around the chlorine nucleus. Chlorine has 17 protons. A diagram of an atom is shown. The nucleus is labeled C l, there are three concentric circles with spheres to represent electrons. The circle closest to the nucleus has 2 electrons, the next circle has 8 electrons, and the final circle has 7 electrons. Which of the following correctly completes the statement? Chlorine has valence electrons, and the effective nuclear charge, Zeff, for the chlorine atom shown is .