Periodic Table

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1234567891011121314151617
Across
  1. 3. Mass, number of protons and neutrons of an atom
  2. 6. mass, Sum of both protons and neutrons in nucleus
  3. 7. A substance that cannot be broken down any further
  4. 10. very reactive nonmetals
  5. 13. Number, number of protons of an atom
  6. 15. negative subatomic partciles
  7. 16. Earth Metals, dense group that tend to react with water
  8. 17. a repeating pattern in the periodic table running horizontally
Down
  1. 1. Metal, most reactive group in the periodic table
  2. 2. elements which are good conductors, malleable, and lusterous
  3. 4. elements having properties of both metals and nonmetals
  4. 5. Gases, inert unreactive elements
  5. 8. number, the number of only atomic protons of an atom
  6. 9. atoms of the same element having the same atomic number but different atomic mass
  7. 11. the smallest unit of a chemical element
  8. 12. elements which are poor conductors, brittle
  9. 14. a family of elements with similar chemical properties