Periodic Table

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