Science crossword

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Across
  1. 3. A colourless inert gaseous occurring in natural gas and with radioactive ores
  2. 7. A transition metal on the periodic table with the symbol Au
  3. 9. A non metal on the periodic table atomic number 8
  4. 10. The basic structure component of all things that have mass and volume
  5. 11. A chemical element with the symbol Fe
  6. 12. When to or more objects make contact with each other
  7. 14. A subatomic particle with a negative charge found in space
  8. 15. An instrument that uses a lens to magnify small objects
Down
  1. 1. A substance that light can pass through
  2. 2. A measure of cold and hot
  3. 4. A substance of atoms that all have the same atomic number
  4. 5. First element on the periodic table
  5. 6. A noble gas with the atomic number 10
  6. 8. A non metal element, it is a key component to living things
  7. 13. The smallest unit of matter