Chapter 7: Elements and the Periodica Table

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Across
  1. 8. a material that allows electricity to flow through easily
  2. 12. elements in the first group of the periodic table
  3. 14. characteristics of matter that can be seen through direct observation
  4. 15. elements that are typically shiny and good conductors of heat and electricity
  5. 16. elements in this group include: fluorine and chlorine
  6. 17. a material that slows down or stops the flow of either heat or electricity
Down
  1. 1. a row of the periodic table
  2. 2. elements in this group include: helium and neon
  3. 3. characteristics of matter that can only be observed when one substance changes into a different substance
  4. 4. the repeating pattern of chemical and physical properties of the elements
  5. 5. a column of the periodic table
  6. 6. the average mass of all the known isotopes of an element
  7. 7. a unit of mass equal to 1.66 x 10^-24 grams
  8. 9. a chart that organizes the elements by their chemical properties and increasing atomic number
  9. 10. elements that are poor conductors of heat and electricity
  10. 11. a material that allows heat to flow easily
  11. 13. an alloy of iron and carbon