Chapter 5 Physical Science

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Across
  1. 2. Sodium is an _________ metal.
  2. 4. As you read across a period, the ___ number increases by one
  3. 5. The number of ____ electrons determines an element's chemical properties
  4. 7. Chlorine is a _________ gas.
  5. 8. Reactive elements, such as alkali metals and halogens, are found in nature only in _______.
  6. 11. Elements in the same _____ have the same number of valence electrons.
  7. 13. Sodium, chromium, and copper are all _____.
  8. 15. The atomic mass unit is the weighted average of the masses of the _____ of an element found in nature.
  9. 18. Elements can be classified as metals, nonmetals, and _____.
  10. 19. A ________ is a row on the periodic table.
Down
  1. 1. Mendeleev's periodic table was useful because it enabled scientists to predict properties of unknown _____.
  2. 3. The column on the far left of the periodic table contains the most _____ metals.
  3. 6. As you move from left to right across a period, the number of valence electrons _____.
  4. 9. Mendeleev organized elements in his periodic table in order of increasing ____.
  5. 10. The atomic number is the number of ____ and electrons in an atom.
  6. 12. One-twelfth the mass of a carbon-12 atom is used to define an atomic mass ____.
  7. 14. Although they are called neon lights, they can contain any ______ gas.
  8. 16. A _______ is a column on the periodic table.
  9. 17. Which element is found in most of the compounds in your body except for water.