Periodic Table

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Across
  1. 1. the name for the horizontal rows of elements
  2. 8. Elements which have existed on Earth since its formation
  3. 9. a family of elements are negatively charged and are poor conductors
  4. 10. when two elements with opposite charges exchange electrons
  5. 11. a family of elements which are positively charged and are good conductors
Down
  1. 2. Elements which have been created in laboratories
  2. 3. When an element has too many or too few neutrons to be stable
  3. 4. the name for the vertical columns of elements
  4. 5. the electric charge of an atom
  5. 6. an element which has an irregular number of neutrons
  6. 7. A group of gases which are almost always inert (are not reactive)