Chemistry crossword

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Across
  1. 4. a chemical combination of two or more elements in a specific ratio
  2. 5. change in the appearance or state of a substance that does not change the composition
  3. 7. group 17 elements in the perodic table,the most reactive not metals
  4. 8. gases group 18 elements in the periodic table,the most stable and interactive elements
  5. 9. compound pure substance formed when non-metals combine
  6. 11. substance that reacts with another substances in a chemical reaction to create new substances with different properties
  7. 15. table a table in which the elements are organized by their physical and chemical properties
  8. 18. something that has mass and occupies space
  9. 19. metals group 1 elements in the peroidic table,not including hydrogeon the most reactive of the metals
  10. 20. combination of pure substances
  11. 21. compound that dissolves in water to form a solution with a ph lower than 7
  12. 22. shell orbit of electrons around the nucleus of an atom
Down
  1. 1. number number of protons in the nucleus of one atom of an element
  2. 2. cloudy mixture in which tiny particles of one substance are held within another and the particles can be separated out
  3. 3. compound pure substance formed when at least one metal and one non metal combine
  4. 6. positively charged particle in the nucleus of an atom
  5. 8. neutral particle in the nucleus of an atom
  6. 10. reaction a reaction that takes place when to or more substances react to form a new substance
  7. 12. chlorine
  8. 13. group of atoms joined by covalent bonds
  9. 14. homogenous mixture mixture of two or more pure substances that looks like one substance
  10. 16. a pure substance that cannot be broken down into other substances,made up of only one type of atom
  11. 17. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be seperatedout from other substances