Elements and the Periodic Table

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Across
  1. 5. elements with properties of metals and nonmetals
  2. 7. substances that can conduct electric current under some conditions but not under others
  3. 11. radioactive isotopes that can be followed through the steps of chemical reaction
  4. 13. amount of time needed for half of the atoms of a sample to decay
  5. 15. a letter that stands for the name of an element
  6. 16. an element that lacks most of the properties of a metal
  7. 20. elements that are good conductors of electric current and heat
  8. 21. the number of protons or electrons in an element
  9. 22. describes the shine and reflectivity of a material
  10. 23. the columns of the periodic table
Down
  1. 1. the sum of protons and neutrons
  2. 2. includes fluorine, chlorine, bromine, and iodine
  3. 3. the rows of the periodic table
  4. 4. an arrangement of elements showing the repeating pattern of their properties
  5. 6. atoms of an element with the same number of protons but different number of neutrons
  6. 8. the property of being able to spontaneously emit radiation
  7. 9. positively charged particles
  8. 10. negatively charged particles
  9. 12. smallest particle that can still be considered an element
  10. 14. average mass of all isotopes of that element
  11. 17. the ease and speed with which an element reacts with other substances
  12. 18. small, postively charged center of an atom
  13. 19. neutrally charged particles