The Periodic Table

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Across
  1. 4. an example of a halogen
  2. 6. Famous for creating the periodic table
  3. 8. an example of alkali metals
  4. 12. If an atom had 6 protons and 6 electrons, it would be a _______ atom.
  5. 13. another example of alkali metals
  6. 14. ______ and protons are two particles have 1 amu.
  7. 18. _________ and protons are two particles that are attracted to each other?
  8. 21. border the zigzag line on the periodic table separates
  9. 23. Which particle has the smallest mass?
Down
  1. 1. Which family is the least reactive?
  2. 2. Which group of non-metals is the most reactive?
  3. 3. Which particle has no charge?
  4. 5. protons and neutrons are the two subatomic particles are located inside the _____?
  5. 7. These elements are called the Nobel gases.
  6. 8. another name for metalloids
  7. 9. Group _____ elements are known as halogens
  8. 10. An element is determined by the number of ...
  9. 11. The most reactive metals are...
  10. 15. Which group of metals are the most reactive?
  11. 16. Which subatomic particle has a positive charge?
  12. 17. The most reactive non-metals are...
  13. 19. Group _____ elements are known as alkaline earth metals.
  14. 20. another example of a halogen
  15. 22. Group _____ elements are known as alkali metals.