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Across
  1. 3. – Elements that are dull and poor conductors.
  2. 4. – Elements that are shiny, flexible, and good conductors.
  3. 6. – Groups used to classify elements.
  4. 9. – A pure substance made of only one kind of atom.
  5. 10. – Rare-earth metals found in the first bottom row.
  6. 11. – Very stable gases in Group 18.
  7. 13. – Patterns that repeat across the table
  8. 14. – A horizontal row on the periodic table.
  9. 16. – How easily an element reacts with others.
  10. 18. – One or two letters that represent an element.
  11. 19. – A vertical column on the periodic table.
  12. 20. – The electrons in the outermost shell of an atom.
Down
  1. 1. – Metals in the center of the periodic table.
  2. 2. – Highly reactive nonmetals in Group 17.
  3. 5. – The number of protons in an atom.
  4. 7. – Radioactive metals found in the second bottom row.
  5. 8. – Elements with properties of both metals and nonmetals.
  6. 12. – Characteristics used to describe an element.
  7. 15. – The energy levels where electrons are found.
  8. 17. – Atoms of the same element with different neutrons.