Periodic Table CrossWord

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Across
  1. 1. a substance that cannot be broken down into another substance
  2. 5. the number of a chemical element in the periodic system
  3. 6. a thing that is composed of two or more separate elements; a mixture.
  4. 8. atoms that have the same number of protons and electrons, but a different number of neutrons.
  5. 10. # of protons + # electrons
  6. 11. a chemical property that describes the tendency of an atom or a functional group to attract electrons toward itself.
  7. 13. he shortest distance between the nuclei of an atom and the atom's outermost shell
  8. 15. 6 protons, 6 neutrons and 6 electrons.
  9. 17. atoms combining to form chemical compounds
  10. 18. the basic unit of a chemical element.
  11. 19. the quantity of matter contained in an atom of an element.
  12. 20. the membrane-enclosed organelle within a cell that contains the chromosomes.
Down
  1. 2. he three-dimensional areas around the nucleus of an atom where a particular electron resides.
  2. 3. an uncharged atomic particle
  3. 4. An elementary particle with a positive charge, found in the nucleus of an atom.
  4. 7. negative +
  5. 9. negatively charged subatomic particle
  6. 10. another term of atomic mass
  7. 12. # of protons + # neutrons
  8. 14. the sum of the numbers of protons and neutrons present in the nucleus of an atom.
  9. 16. positive +