Chemistry Crossword Puzzle

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Across
  1. 1. a vertical column in the Periodic Table
  2. 4. the five non-metallic elements found in group 17 of the periodic table
  3. 7. a substance made up of atoms of two or more different elements joined by chemical bonds
  4. 9. any of the elements found in Group IA of the periodic table (the first column)
  5. 10. composed of dissimilar components
  6. 12. a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom
  7. 15. describes something that has a uniform structure or composition throughout
  8. 18. an element that has properties of both metals and nonmetals, sometimes referred to as a semiconductor
  9. 19. the total number of protons and neutrons in an atom
  10. 20. the positively charged center of the atom consisting of protons and neutrons
Down
  1. 2. particle found in a nucleus with a positive charge
  2. 3. any of the seven chemical elements that make up Group 18
  3. 5. equal to the number of protons in an atom's nucleus
  4. 6. the six chemical elements in group 2 of the periodic table
  5. 8. a stable negatively charged component of an atom
  6. 11. a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction
  7. 13. the smallest component of an element
  8. 14. the name given to a horizontal row of the periodic table
  9. 16. an element that is shiny and that conducts heat and electricity well
  10. 17. an element that conducts heat and electricity poorly and that does not form positive ions in an electrolytic solution