Chemistry Vocabulary

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Across
  1. 2. the basic unit of a chemical element
  2. 4. an extremely tiny particle with a positive charge; is in the center of the atom and makes up the nucleus
  3. 7. the mass of an atom of a chemical element expressed in atomic mass units
  4. 8. a heterogenous mixture in which some of the particles settle out of the mixture upon standing
  5. 13. a energy level defined by quantum theory
  6. 14. a diagram that represents the variation of a variable
  7. 16. where electrons are likely to be found
  8. 19. a combination of two or more substances
  9. 22. a variable that depends on other factors
  10. 25. a pure substance that is made up of two or more different elements combined by chemical bonds
  11. 26. a simple way of writing down the locations of all the electrons in an atom
  12. 29. in the center of the atom with the protons making up the nucleus
  13. 33. the number of digits in a value
  14. 35. the energy required to remove an electron from an atom
  15. 36. electrons in the outermost shell
  16. 37. a physical substance
  17. 38. the tendency of an atom to attract an electron to itself
  18. 39. any of two or more forms of a chemical element
Down
  1. 1. a positively charged ion
  2. 3. a model presented by niels bohr and ernest rutherford in 1913
  3. 5. a row of elements in the periodic table
  4. 6. a variable that stands alone
  5. 7. a negatively charged ion
  6. 9. a process for experimentation that is used to explore observations and answer questions
  7. 10. the number of protons in the nucleus of an atom
  8. 11. a type of matter that has definite chemical and physical properties
  9. 12. a group of atoms bonded together
  10. 13. physically combined; can be separated
  11. 15. a negative charge that surrounds the nucleus
  12. 17. objects, events, ideas, feelings, time periods, or any other types of categories that you are trying to measure
  13. 18. heterogenous, even though it looks homogenous
  14. 20. a pure substance that contains of only one kind of atom
  15. 21. a way of representing atoms or molecules as dots surrounding the element symbols
  16. 23. a table of chemical elements arranged in order of atomic number
  17. 24. the central part of the atom; contains protons and neutrons
  18. 27. fixed distances from the nucleus of an atom where electrons may be found
  19. 28. the size of a neutral atom
  20. 30. specific patterns that are presented in the periodic table
  21. 31. the number of protons minus the number of electrons
  22. 32. a column of elements in the periodic table
  23. 34. the chemical element in group 18 of the periodic table