The Periodic Table

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Across
  1. 2. Atomic number 79
  2. 7. This element makes up about 21% of the earth's atmosphere
  3. 8. They are reactive nonmetallic elements that form strongly acidic compounds with hydrogen from which simple salts can be made
  4. 11. Symbol "Sr" on the periodic table
  5. 12. Greenish-yellow gas
  6. 16. Brittle, dull, semiconductors
  7. 17. Members of a family of an element that all have the same number of protons, but different number of neutrons
  8. 18. The second noble gas on the periodic table
  9. 19. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
  10. 20. Rows on the periodic table
Down
  1. 1. Water is made up of ________ and oxygen
  2. 2. Columns on the periodic table
  3. 3. Typically gasses at room temperature
  4. 4. The smallest unit into which matter can be divided
  5. 5. Found in group 14, period 2
  6. 6. Malleable, ductile, good conductors of heat
  7. 9. Used in toothpaste
  8. 10. Determine that atomic number of an element
  9. 13. There are about 90 of these found in nature
  10. 14. Transition metal with the atomic number 23
  11. 15. _______ metals are found in the first group on the periodic table