The Periodic Table Crossword Puzzle

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Across
  1. 2. Occuring within an atom
  2. 5. Electrically neutral
  3. 8. An atom with a charge
  4. 9. Substance that cannot be broken down into any other substance
  5. 12. Negative charge of 1-
  6. 14. Positive charge of 1+
  7. 16. Russian scientist, first organized the periodic table of elements
  8. 18. Elements whose properties are intermediate between those of metals and nonmetals
Down
  1. 1. Rows (across) on the Periodic Table
  2. 3. Bond between nonmetals
  3. 4. Smallest part of an element, retains elements properties
  4. 6. New Zealand physicist, proposed that the majority of the mass of an atom was found in the center
  5. 7. The smallest particle of an element that retains the elements properties
  6. 8. Bond between a metal and nonmetal
  7. 10. Atoms of the same element that have a different number of neutrons
  8. 11. Columns (up/down) on the Periodic Table
  9. 13. Two or more elements, chemically combined
  10. 15. Elements that are shiny, good conductors, and found on the left of the Periodic Table
  11. 16. English scientist, discovered atomic number, and corrected mendeleevs arrangement of the periodic table
  12. 17. Elements that are dull, brittle, and often a gas at room temperature