Chemistry

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