Basic vocabulary about chemistry and physics

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Across
  1. 2. Any substance used in treating disease or illness
  2. 4. It is just the propagation or storage of energy through a medium or the vacuum, without any transfer of the medium itself
  3. 5. (in two words) Abbreviation used in chemistry, normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised
  4. 8. They are all around you : the food you eat, the clothes you wear. You, in fact, are made up of a wide variety of them
  5. 12. Anything that takes up space and can be weighed
  6. 14. Power to do work that produces light, heat, or motion
  7. 15. It is defined as the electromagnetic radiation with wavelengths between 400 and 800 nm which is visible to the human eye
  8. 16. The chemical element of atomic number 7, a colourless, odourless unreactive gas that forms about 78 per cent of the Earth's atmosphere
  9. 17. A fluid (such as air) that has neither independent shape nor volume but tends to expand indefinitely
Down
  1. 1. It's everything ! It includes all of space, and all the matter and energy that space contains. It even includes time itself and, of course, it includes you
  2. 3. The smallest unit into which matter can be divided without the release of electrically charged particles
  3. 5. Science of composition, structure, properties and reaction of matter
  4. 6. A strong, hard magnetic metal, the chemical element of atomic number 26, much used as a material for construction and manufacturing
  5. 7. An other word for combustion
  6. 9. Chemical substance that is made up of only one type of atom
  7. 10. It is a combination of more than one element
  8. 11. Science of matter and energy and of interactions between the two
  9. 13. Something (such as a perfume) compounded to give off a sweet or pleasant odor