Periodic Table

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Across
  1. 2. A tool used world wide to categorize elements.
  2. 3. The mass of particles of matter in an atom.
  3. 5. Elements organized into columns.
  4. 7. one or two letters representing an element.
  5. 8. the title of an element, lists its name.
  6. 9. Russian scientist who realized and organized elements by a set of patterns.
  7. 10. "in regular, repeated pattern."
Down
  1. 1. a row of elements across the periodic table.
  2. 4. The number of protons in the nucleus of an atom.
  3. 6. a substance made of one type of atom.