Chemistry

12345678910111213141516171819202122232425
Across
  1. 1. of conservation of mass the mass of the products in a chemical reaction must equal the mass of the reactants
  2. 5. a group of atoms bonded together
  3. 6. gas helium
  4. 10. changes during a reaction
  5. 13. energy is released
  6. 14. what you get after you mix things together
  7. 16. no electric charge
  8. 17. negatively charged
  9. 20. Mendeleev developed the periodic table
  10. 22. sodium, alike metals has one electron
  11. 23. consists of protons and electrons
  12. 25. how the elements are arranged with increasing atomic numbers
Down
  1. 2. mass their absorbency
  2. 3. energy is absorbed
  3. 4. the material of chemical gas or metal that is on the periodic table
  4. 7. to place farmers do what to crops every year
  5. 8. the smalles unit of an element
  6. 9. positively charged element
  7. 11. can form alloys with metals
  8. 12. 18 numbers groups on the periodic table
  9. 15. two electrons and is associated with a region of a chemical bond
  10. 18. composed of two or more separate elements
  11. 19. metal very brittle and cannot be made into wire
  12. 21. electrons participate in thr formation of a chemical bond
  13. 24. the letters of an element (au)