Atoms and Elements

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Across
  1. 3. pure substance consisting only of atoms that all have the same numbers of protons in their nuclei.
  2. 5. neutrally charged ion
  3. 6. atomic symbol of lead
  4. 8. an orbit followed by electrons around an atom's nucleus.
  5. 9. abbreviations used in chemistry for chemical elements
  6. 15. the small, dense region consisting of protons and neutrons at the center of an atom
  7. 17. number of protons found in the nucleus of every atom of that element.
  8. 18. atomic number 11
Down
  1. 1. when you add or take away neutrons
  2. 2. the system of electrons surrounding the nucleus of an atom.
  3. 4. atomic mass of oxygen
  4. 6. a row of chemical elements
  5. 7. positively charged ion
  6. 9. smallest unit of matter
  7. 10. when you add or take away electrons
  8. 11. atomic number of chlorine
  9. 12. quantity of matter contained in an atom of an element.
  10. 13. arranged into 18 numbered columns
  11. 14. atomic symbol of gold
  12. 16. negatively charged ion