Intro to Atoms and the Periodic Table

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Across
  1. 4. 2 or more elements chemically bonded
  2. 6. Mass Number - Atomic Number =
  3. 12. The property of an atom that causes it to have weight
  4. 13. Neutral charged particles around the nucleus
  5. 14. Another name for electron orbits
  6. 16. Atomic Mass Unit (abbreviated)
  7. 17. Abbreviation for each element
  8. 18. The sum of the number of neutrons and protons
  9. 19. Positive particles around the nucleus
  10. 20. The vertical rows in the periodic table
Down
  1. 1. Pure substances that can't be broken down or changed
  2. 2. Located outside the nucleus with electrons
  3. 3. The 8th element of the periodic table
  4. 5. Arrangement of elements according to atomic number on a table
  5. 7. Negative particles outside the nucleus
  6. 8. common name for the compound NaCl
  7. 9. When positive and negative charges cancel each other out
  8. 10. Number of protons represents
  9. 11. Center of atom
  10. 15. The horizontal rows in the periodic table