Chemistry

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Across
  1. 2. what are a good conductors of heat and electricity
  2. 3. Isotope is an _______ version of that atom
  3. 4. the ________ & neutrons are found in the center of the area
  4. 6. pure substances composed of two or more different elements that are chemically joined are called
  5. 12. electrons have _________ charge
  6. 14. metals: what kind of metals are the most reactive metals
  7. 15. electrons: the electrons int the outermost shell of any element are called
  8. 17. the number of vaance electrons
  9. 19. energy rings contain what
  10. 21. the heaviest metal on the periodic table
  11. 23. a horizontal row on a period table
  12. 24. where are protons and neutrons found
  13. 26. adding a neutron makes an _________ of that atom
  14. 27. most of the elements on the periodic table occur as ______ at room tempertaure.
  15. 28. what kind of elements are more stable when joined in a pair
  16. 29. ________ consist of only kind of atom
  17. 32. rings: electrons live in something called shells or _________________
  18. 33. model: what shows all of the particles in the atom
  19. 34. the lightest metal on the periodic table
  20. 35. what do neutrons have none of
  21. 37. lightest non-metal
Down
  1. 1. what state of matter does iron appear at room temprature
  2. 2. anything that takes up space and has mass
  3. 3. the most reactive non-metals are the __________
  4. 5. what is it called when there ia a number beside the element's symbol?
  5. 7. hundred fourteen: how many elements are known at the present time
  6. 8. metals: another name for group 5
  7. 9. dot structure: only shows the elements symbol and it's outer most electron shell
  8. 10. how many electrons can the 3rd energy ring hold up too.
  9. 11. atomic mass is the number of protons and ______
  10. 13. there are seven elements that form _______ consisting of two atoms
  11. 14. matter is made up of....
  12. 16. atoms: compounds always contain the same ratio of __________
  13. 18. table: is a list of all the elements that can build matter
  14. 20. The periodic table is a little like the alphabet of.......
  15. 22. bond: what kind of a bond occurs between a non metal and a metal
  16. 25. many of the non metals and hydrogen
  17. 30. only _______ and bromine can be found as liquid on the periodic table
  18. 31. element's ________ is an abbreviation for the element
  19. 36. number: is the number of protons and neutrons
  20. 38. gases: what kind of gases are stable and do not react with anything