The Periodic Table

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