PERIODIC TABLE CROSSWORD PUZZLE

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Across
  1. 3. an element that has some properties of a metal and some properties of a nonmetal
  2. 4. the number of protons contained in each nucleus of its atoms of the element.
  3. 5. a substance that cannot be broken down into a simpler substance by ordinary chemical means
  4. 7. describes how likely an element is to form bonds with other elements
  5. 10. an element or substance that conducts heat and electricity
  6. 12. the smallest unit of an element that has all of the propeties of the element
  7. 13. three laws
  8. 15. a bond formed by the transfer of electrons
  9. 17. a chart that organizes information about all of the known elements accourding to thier properties
  10. 19. a horizontal row ( left to right) in the periodic table
  11. 20. electrons that are located in the outermost energy level of an atom
Down
  1. 1. the single capital letter or capital letter followed by a lower case letter or letters that represents the name of the element
  2. 2. a bond formed when two atoms share valence electrons
  3. 6. an element that does not conduct electricity or heat and is usually a gas at room temperature
  4. 8. the region surrounding the nucleus of an atom where the electrons are located
  5. 9. the smallest unit of a compound that has all of the properties of the compound
  6. 11. a vertical column (up and down) on the periodic table
  7. 14. anything that has mass and volume
  8. 16. number of protons and neutrons in the nucleus of one atom of the element
  9. 18. an atom that has gained or lost one or more electrons