Chemistry

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