Element crossword puzzle

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Across
  1. 3. when two or more elements combine with a chemical change to create a new substance
  2. 5. contains all elements and is organized by different categories
  3. 7. number of protons in the nucleus
  4. 9. positively charged center of the atom that contains protons and neutrons
  5. 10. combination of two or more elements that are not chemically combined
Down
  1. 1. combined number of protons and neutrons in the nucleus
  2. 2. positively charged particles
  3. 4. this substance can be found on the left side of the periodic table and is bendable and shiny
  4. 6. things that make up matter and can be found on the periodic table
  5. 8. this kind of substance can be found on the right side of the periodic table and are dull and brittle