Elements and the Periodic Table

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Across
  1. 2. the core of an atom
  2. 3. atoms with the same number of protons and different number of neutrons
  3. 5. two rows of elements placed beneath the periodic table
  4. 6. an abbreviation of the elements name in english
  5. 7. the ability of an object to transfer heat or electricity to another object
  6. 9. has a negative charge and moves around in an atom
  7. 10. the columns on a periodic table
  8. 12. has the positive charge in an atom
  9. 13. the metals in group two
  10. 18. the sum of the protons and neutrons in the nucleus
  11. 19. the mass of an atom of a chemical element explained in atomic mass units
  12. 20. the ease and speed with which an element combines or reacts with another element
Down
  1. 1. when iron isn't protected it will slowly turn to a reddish brown rust
  2. 4. the elements in groups 3-12
  3. 8. created the periodic table
  4. 11. the rows on a periodic table
  5. 14. the number of protons in the nucleus
  6. 15. the metals in group one
  7. 16. has no charge in an atom
  8. 17. array of chemical elements organized by atomic numbers from the elements