Periodic Table

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