Periodic Table

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Across
  1. 1. an atom that has gained or lost one or more electrons
  2. 3. the smallest the unit of an element
  3. 7. a vertical column (up and down)
  4. 10. a substance that cannot be broken down into a simpler substance
  5. 11. the element for He
  6. 14. the element for Na
  7. 15. positive charge
  8. 16. has properties of a metal and some properties of a nonmetal
  9. 18. the element for C
  10. 19. neutral charge
Down
  1. 2. the element for N
  2. 4. anything that has mass and volume
  3. 5. negative charge
  4. 6. the smallest unit of a compound
  5. 8. how likely an element is to form bonds with other elements
  6. 9. horizontal row (left to right)
  7. 12. an element or substance that conducts heat and electricity
  8. 13. an element that doe not conduct electricity or heat
  9. 17. the element for K
  10. 20. the element for O