Chemistry

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Across
  1. 2. two electrons and is associated with a region of a chemical bond
  2. 3. no electric charge
  3. 4. the smalles unit of an element
  4. 5. the material of chemical gas or metal that is on the periodic table
  5. 7. positively charged element
  6. 8. can form alloys with metals
  7. 11. energy is released
  8. 12. 18 numbers groups on the periodic table
  9. 13. the mass of the products in a chemical reaction must equal the mass of the reactants
  10. 17. energy is absorbed
  11. 18. to place farmers do what to crops every year
  12. 19. a group of atoms bonded together
  13. 21. changes during a reaction
  14. 22. consists of protons and electrons
  15. 23. the letters of an element (au)
Down
  1. 1. electrons participate in thr formation of a chemical bond
  2. 3. very brittle and cannot be made into wire
  3. 6. developed the periodic table
  4. 7. what you get after you mix things together
  5. 9. helium
  6. 10. contains the same amount of protons and electrons
  7. 14. their absorbency
  8. 15. composed of two or more separate elements
  9. 16. negatively charged
  10. 20. how the elements are arranged with increasing atomic numbers
  11. 24. sodium, alike metals has one electron