Chemistry Crossword

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Across
  1. 3. What is the lightest metal in the periodic table?
  2. 6. Which element is liquid at room temperature?
  3. 7. Which element is essential for breathing?
  4. 8. Which group is known as noble gases?
  5. 10. What is the most electronegative element?
Down
  1. 1. Which element has the symbol ‘Na’?
  2. 2. What is the atomic number of carbon?
  3. 4. What is the first element in the periodic table?
  4. 5. Who is the father of the periodic table?
  5. 9. What is the chemical symbol of gold?