crossword puzzle

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Across
  1. 1. elements of group on this table
  2. 3. atomic symbols is Li
  3. 7. cannot change shape easily
  4. 9. atomic number of 6
  5. 10. not solids or gases
  6. 11. group 18 on the periodic table
  7. 12. equations must be
Down
  1. 1. row of chemical elements of the periodic table
  2. 2. make up the periodic table
  3. 4. combination of elements
  4. 5. stretched into thin wires
  5. 6. a column in the periodic table of chemical elements
  6. 8. Metals in group 1
  7. 12. model for elements
  8. 13. the number of element location on the table