The Periodic Table

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