The Periodic Table

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Across
  1. 2. The chemical symbol of lead is
  2. 5. If there is a second letter in the chemical symbol, it is always ....
  3. 8. There are ... known elements on the periodic table.
  4. 10. One or Two letters that represent an element.
  5. 12. There are ... non-metals in the first 20 elements of the periodic table
  6. 14. Element with the chemical symbol of Na
  7. 15. The heaviest element
  8. 17. How many elements have scientists discovered naturally?
  9. 18. Chemical symbol of magnesium
  10. 20. Number of protons an atom contains
  11. 21. Element with the atomic number of 5
  12. 22. (TRUE/FALSE)
Down
  1. 1. ... atoms has the highest mass
  2. 3. The first element on the periodic table is Helium. (TRUE/FALSE)
  3. 4. What do we call the table that shows all the elements?
  4. 6. Elements in the same column share similar chemical and ... properties.
  5. 7. How many elements were made in the laboratory?
  6. 9. The man who invented the periodic table
  7. 11. There are ... metals in the first 20 elements of the periodic table
  8. 13. The atoms of the elements increase in ... as you read across each row.
  9. 16. Rows in a periodic table.
  10. 19. Columns in a periodic table.