Periodic table

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Across
  1. 5. a pure substance consisting only one type of atom
  2. 7. which group of elements are un-reactive
  3. 8. what element is liquid at room temperature?
  4. 9. what is the chemical symbol for gold?
  5. 11. what are most elements on the periodic table
  6. 12. each horizontal row on the periodic table is called what?
  7. 14. on the periodic table, what is used to help distinguished between the metals and nonmetals?
  8. 16. as?
Down
  1. 1. which group of elements does not change or melt when placed in fire?
  2. 2. a substance that IS NOT chemically combined and can be separated
  3. 3. what is the name of the element with the symbol of 'Mg'?
  4. 4. around how many elements are on the periodic table?
  5. 6. more than one element held together by chemical bonds
  6. 10. the number of protons found in the nucleus of an atom is known as the...
  7. 13. how many periods are there in the periodic table?
  8. 15. hydrochloric acid is shown in a symbol form as what?