Chemistry crossword

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