stuff from last 2 week

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Across
  1. 5. a chart of the elements arranged into rows and columns according to their physical and chemical properties
  2. 8. an element in group 328 on the periodic table
  3. 9. positive charges
Down
  1. 1. an element in group 1 on the periodic table
  2. 2. a column on the periodic table
  3. 3. a small particle that is the building block of matter
  4. 4. negative charges
  5. 6. a element in group 17 on the periodic tables
  6. 7. anything that has mass and volume
  7. 9. a row on the periodic table