EC Crossword Puzzle

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Across
  1. 1. atoms with same number of electrons
  2. 3. the general name for a series of methods for separating mixtures by employing a system with a mobile phase and a stationary phase
  3. 5. particles that are not charged
  4. 6. a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the outermost isolated electron
  5. 7. horizontal rows on periodic table
  6. 9. measure of an atoms tendency to attract bonding electrons
  7. 13. negatively charged particles
  8. 14. mixtures that have visibly distinguishable parts
  9. 18. an atom or a group of atoms that has a net positive or negative charge
  10. 21. definite and constant composition; cannot be separated physically; element or compound
  11. 22. a Group 8A element
  12. 24. protons, neutrons, and electrons
  13. 25. energy required to remove an electron from an atom in the gas phase
Down
  1. 2. given compound always contains the same proportions of elements by mass
  2. 4. an ion containing a number of atoms
  3. 8. a method for separating the components of a mixture containing a solid and a liquid
  4. 10. 2 or more elements/compounds combined; do not have uniform chemical composition
  5. 11. positively charged particles
  6. 12. amount of energy released when an electron attaches to a neutral atom or molecule in the gaseous state to form an anion
  7. 15. vertical columns on periodic table
  8. 16. uniformly combined
  9. 17. negatively charged ion
  10. 19. a method for operating the components of a liquid mixture that depends on differences in the ease of vaporization of the components
  11. 20. atoms with the same number of protons but different numbers of neutrons
  12. 23. postively charged ion