Periodic Table Crossword

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Across
  1. 4. _____metals- highly reactive metals
  2. 5. matter made of only one kind of atoms
  3. 8. atomic_____-the weight of each element
  4. 10. neutral charge, same mass as proton, in the nucleus
  5. 11. usually gases or brittle solids at room temperature and poor conductors of heat and electricity
  6. 12. doesnt conduct electricity as well as a metal, but does conduct electricity better than a nonmetal
  7. 15. _____Earth metals- fairly reactive metals, never found uncombined in nature
  8. 16. positively charged particle in nucleus
  9. 17. ______elements- made in laboratories and nuclear reactors
  10. 18. an element that shares some properties with metals and some with nonmetals
Down
  1. 1. atomic_____-the number of protons in the nucleas of an atom of that element
  2. 2. _____gases- unreactive gases, always found on their own in nature
  3. 3. a substance that can make something happen faster but does not change itself
  4. 6. ______elements- eight groups of elements in the periodic table
  5. 7. ______elements- groups 3 to 12 in the periodic table
  6. 9. ______cloud- a region surrounding the nucleus
  7. 13. _____electron- an electron in the outer layers of the electron cloud
  8. 14. contains elements that have similar or physical chemical properties
  9. 16. row of elements in the periodic table whose properties change gradually and predictably
  10. 18. element that has luster, is a good conductor of heat and electricity, and is ductile