CHM 111 - Chap. 7-8 1 2 3 4 5 6 7 8 9 10 13 11 12 14 15 16 17 18 19 20 ACROSS 1. ___ effect: When light striking the surface of a metal causes a current to flow. 4. The ___ principle says that we cannot the exact position and speed of an object. 11. Electrons that have absorbed energy and moved to a level farther from the nucleus are in a(n) ___ state. 13. When the light from an excited gas is separated into its colors we get a bright ___ ___. 16. ___ oxides are acidic. 17. ___'s model of the atom requires the electrons to be at specific energy levels. 19. ___ energy is the energy needed to pull an electron off an atom. 20. ___ atoms are not attracted by a magnetic field. DOWN 2. ___ ___ indicates that electrons in a subshell will have less energy if they are unpaired and have the same spin. 3. The distance from the crest of one wave to the crest of the next wave is called the ___. 5. An atom and ion, or ions that have thee same electron configuration are ___. 6. The shell number of an electron corresponds to the ___ quantum number. 7. Visible light is just one form of ___ radiation. 8. The ___ of light is proportional to the energy in its photons. 9. Quantum of energy in light. 10. Invisible light that we feel as heat. 12. The bending of a wave as it passes through a small opening. 14. The cation of an element is ___ than the neutral atom. 15. Ions of the main group elements usually have ___ ___ electron configurations. 18. Which has more energy: radio waves or gamma waves?