chemistry crossword unit B by:Ella and Meg

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Across
  1. 2. metals most reactive metals especially in air and water and moving down the column the element get more reactive
  2. 3. substance that's at the start of the reaction
  3. 5. made up of one type of matter and has unique set of characteristic
  4. 6. uses words to define a compound
  5. 7. the most stable and reactive and can make new substances sometimes
  6. 8. represents the number of atoms
  7. 12. anything that has mass and occupies space
  8. 14. when two nonmetals combine
  9. 16. slow chemical change, when oxygen in the air reacts with metal. The metal is decomposed
  10. 17. is the average mass of an element in atomic mass units
  11. 20. tells you the number of protons and electrons
  12. 21. absorbs heat
  13. 22. when oxygen reacts with a substance to form a new substance and gives off energy
  14. 25. 7 Rows go to metals to non-metals and the atomic number increase by 1
Down
  1. 1. most reactive non-metals and can be used to form new and helpful substances
  2. 4. uses symbols and numbers to represent a compound
  3. 9. two or more substances combine to form new substances
  4. 10. new substance produced in a chemical reaction between reactants
  5. 11. Are results from a chemical reaction
  6. 13. formed when at least one metal and nonmetal combines
  7. 15. releases heat
  8. 18. can be in between metals and non-metals
  9. 19. anything on the periodic table and made up of only one type of atom
  10. 23. an atom or group of atoms that has become electrically charged
  11. 24. 18 colums and is similar in chemical properties