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Across 1. Periodic table family that contains very unreactive elements such as helium and neon (2 words). 5. An electron in the outermost occupied energy level (2 words) 6. Atomic ______ is the distance from the nucleus to the outermost electrons. 8. An atom with unequal numbers of protons and electrons 9. A column in the periodic 11. Metals that react in water such as potassium or sodium. 12. ______ energy is the amount of energy required to remove the outermost electron from the atom.

Down 2. The strength of attraction between a nucleus and the outermost electrons. 3. A row in the periodic table 4. An atom which contains more electrons than protons. 7. Number of valence electrons in oxygen 10. An atom which contains more protons than electrons