Element Crossword Puzzle

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Across
  1. 3. The number of protons in the nucleus of an atom
  2. 4. Hg
  3. 6. Any substance that cannot be decomposed into simpler substances by ordinary chemical processes
  4. 9. The most abundant gas in the atmosphere
  5. 11. Subatomic particle with a negative charge and almost no mass
  6. 13. Zig-zag line of elements on the table; usually have variable properties
  7. 14. A gaseous chemical element that does not readily enter into chemical combination with other elements
  8. 16. Columns of a periodic table
  9. 18. Liquid, gas, or solid that dissolves during a reaction
  10. 20. Subatomic particle with a positive charge and equal mass to a neutron
  11. 21. The quantity of matter contained in an atom
Down
  1. 1. A basic unit of matter and the smallest unit of an element
  2. 2. Elements on the left side of the table; usually ductile and malleable
  3. 5. A science that deals with the composition, structure, and properties of substances and of the transformations that they undergo
  4. 7. The positively charged center of the atom consisting of protons and neutrons
  5. 8. Rows of a periodic table
  6. 10. Subatomic particle with the same mass as a proton; has no charge
  7. 12. The organized array of all the chemical elements in order of increasing atomic number
  8. 14. Elements of the right side of the table; usually poor conductors
  9. 15. Substance that dissolves other substances
  10. 17. Ag
  11. 19. An atom with a charge