Periodic Table

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Across
  1. 5. dense group that tend to react with water
  2. 7. most reactive group in the periodic table
  3. 9. the smallest unit of a chemical element
  4. 11. atoms of the same element having the same atomic number but different atomic mass
  5. 13. A substance that cannot be broken down any further
  6. 15. negative subatomic partciles
Down
  1. 1. inert unreactive elements
  2. 2. number of protons of an atom
  3. 3. elements which are good conductors, malleable, and lusterous
  4. 4. very reactive nonmetals
  5. 6. number of protons and neutrons of an atom
  6. 8. elements having properties of both metals and nonmetals
  7. 10. elements which are poor conductors, brittle
  8. 12. a repeating pattern in the periodic table running horizontally
  9. 14. a family of elements with similar chemical properties