Hannah mullane - chemistry crossword

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Across
  1. 1. Is sodium hydroxide (NaOH) an acid or base?
  2. 4. Ra is the symbol for?
  3. 7. What is the name given to substances that are initially involved in a chemical reaction?
  4. 10. What is the first element on the periodic table?
  5. 11. is the fourth most abundant element in the universe in terms of mass?
  6. 12. What orbits the nucleus of an atom?
  7. 14. Atoms of the same chemical element that have different atomic mass are known as?
  8. 15. What is the chemical symbol for gold?
Down
  1. 2. What is the third most common gas found in the air we breathe?
  2. 3. What is the main gas found in the air we breathe?
  3. 5. At room temperature, what is the only metal that is in liquid form?
  4. 6. What is H20 more commonly known as?
  5. 8. K is the chemical symbol for which element?
  6. 9. What is the centre of an atom called?
  7. 13. True or false? Acids have a pH level below 7.