Standard 3 Crossword

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Across
  1. 6. a pure substance that cannot be broken down by physical or chemical means
  2. 7. the particles found in the nucleus of an atom are neutrons and __________
  3. 8. if a train were a polymer, each train car would be a __________
  4. 10. outermost electrons on an atom
  5. 14. a material that is made of a single type of particle
  6. 16. a type of solid that does not have an orderly arrangement of its particles
  7. 18. particle found in a cloud outside the nucleus
  8. 20. the number of valence electrons will predict how ________ an element is
  9. 22. the smallest amount of an element
  10. 23. the first 92 elements are ________ occurring
  11. 25. the number on the periodic table that shows how energy levels an atom will have
  12. 26. name of a combination of two or more substances physically combined
  13. 28. rubber is an example of a _________ polymer
  14. 29. an ion always has a(n) __________ number of protons and neutrons
  15. 30. a substance with an orderly three-dimensional arrangement of particles
  16. 31. most of the mass of an atom is found in the ___________
Down
  1. 1. element with only 6 protons in its nucleus
  2. 2. unit of measurement used for the mass of subatomic particles
  3. 3. chemical symbol for germanium
  4. 4. information on the periodic table that tells you how many protons can be found in one atom of an element
  5. 5. a chemical symbol on the periodic table is a(n) __________ for the element's name
  6. 7. a long chain of molecules combined into a larger molecule
  7. 8. particle formed when two or more atoms chemically bond together
  8. 9. element on the periodic table with the lowest mass
  9. 11. type of bond that holds water molecules together
  10. 12. atoms are always electrically ____________
  11. 13. the most massive element with only one valence electron
  12. 14. characteristics of a substance
  13. 15. type of bond formed between metals and non-metals
  14. 17. element with 6 valence electrons and 6 electron energy levels
  15. 19. substance formed when two or more elements combine
  16. 21. has the symbol Ar
  17. 24. another word for a column on the periodic table
  18. 27. subatomic particle without an electrical charge