The Periodic Table

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12345678910111213141516171819
Across
  1. 2. found to the right of the zigzag line on the periodic table
  2. 5. atoms that have the same number of protons but different numbers of neutrons are this of each other
  3. 7. less reactive than alkali metals
  4. 9. very reactive because their atoms neeed to gain only one electron to have a complete outer level
  5. 10. the most common element from Group 13, most abundant element in Earth's crust
  6. 13. the most abundant element in the universe, found in large amounts in stars
  7. 15. states that the repeating chemical and physical properties of elements change periodically with the elements' atomic numbers
  8. 16. another commonly found member of Group 16, used to make sulfric acid
  9. 17. vertical column of elements on the periodic table
  10. 18. horizontal row of elements on the periodic table
  11. 19. are found to the left of the zigzag line on the periodic table
Down
  1. 1. elements of Groups 3-12
  2. 3. gas at room temperature, makes up about 80% of the air that you breathe
  3. 4. also known as semimetals, are the elements that border the zigzag line on the periodic table
  4. 6. elements in Group 1 of the periodic table
  5. 8. Russian chemist, discovered a pattern to the elements in 1869
  6. 11. British scientist, determined the number of protons, the atomic number in an atom
  7. 12. unreactive nonmetals and are in Group 18 of the periodic table
  8. 14. makes up about 20% of the air, necessary for substances to burn
  9. 15. "happening at regular intervals"