Chemistry Crossword puzzle by Eniayo

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Across
  1. 4. A vertical row of the periodic table
  2. 6. cloud where elctrons are located
  3. 7. The ability for something to break easily
  4. 8. a thing that is composed of two or more elements
  5. 9. The center of an atom
  6. 12. table the table of all the elements
Down
  1. 1. a small particle with a negative charge
  2. 2. anything that takes up space and has mass
  3. 3. number the amount of protons in an element
  4. 5. the horizontal row of the periodic table
  5. 10. How shiny something is and how it reflects light
  6. 11. the study of properties and the basics of matter