Science Crossword

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Across
  1. 3. is the chemical symbol for which element?
  2. 5. orbits the nucleus of an atom?
  3. 7. (around 78%):What is the main gas found in the air we breathe?
  4. 8. sodium hydroxide (NaOH) an acid or base?
  5. 9. is the fourth most abundant element in the universe in terms of mass?
  6. 10. is H20 more commonly known as?
  7. 11. New Zealand scientist Ernest Rutherford was awarded a Nobel Prize in which field?
  8. 14. is the first element on the periodic table?
  9. 16. Fission:A nuclear reaction where the nucleus of an atom splits into smaller parts is known as nuclear fission or nuclear fusion?
  10. 17. or false? An electron carries a positive charge.
  11. 18. is the chemical symbol for gold?
Down
  1. 1. or false? Acids have a pH level below 7.
  2. 2. of the same chemical element that have different atomic mass are known as?
  3. 4. room temperature, what is the only metal that is in liquid form?
  4. 6. or false? Bases have a pH level below 7.
  5. 12. is the name given to substances that are initially involved in a chemical reaction?
  6. 13. nucleus:What is the centre of an atom called?
  7. 15. (around 1%):What is the third most common gas found in the air we breathe?