## University Physics with Modern Physics (14th Edition)

a. Carbon has 6 electrons. Consider the subshells in the order of increasing energy. An s subshell holds 2 electrons, p subshells hold 6 electrons, and d subshells hold 10 electrons. This is the ground-state electron configuration for carbon. $$1s^2 2s^2 2p^2$$ b. Si is below C in the periodic table, with Z=14. $$1s^2 2s^2 2p^6 3s^2 3p^2$$