Periodic Table

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123456789101112131415
Across
  1. 3. dense group that tend to react with water
  2. 4. most reactive group in the periodic table
  3. 5. inert unreactive elements
  4. 7. number of protons and neutrons of an atom
  5. 8. a family of elements with similar chemical properties
  6. 11. atoms of the same element having the same atomic number but different atomic mass
  7. 13. elements having properties of both metals and nonmetals
  8. 14. the smallest unit of a chemical element
  9. 15. number of protons of an atom
Down
  1. 1. very reactive nonmetals
  2. 2. elements which are good conductors, malleable, and lusterous
  3. 6. negative subatomic partciles
  4. 9. a repeating pattern in the periodic table running horizontally
  5. 10. elements which are poor conductors, brittle
  6. 12. A substance that cannot be broken down any further