negative electrons are

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Across
  1. 4. most reactive metals
  2. 6. what tells the number of protons in an atom of the element
  3. 8. description structure of atoms
  4. 10. protons are
  5. 13. what are electrons in the outermost energy level called
  6. 16. holds the protons and neutrons
  7. 19. developed the first periodic table of elements, organized by atomic mass
Down
  1. 1. eleceltrons are
  2. 2. what are the smallest particles of an element that still have properties of that element called
  3. 3. postive and are in the nucleus
  4. 5. what is the smallest particle aware to scientists
  5. 7. what are atoms of the same elements with diffrent numbers of neutrons called.
  6. 9. non reactive elements, due to already being chemicaly stable
  7. 10. the horizontal rows on the periodic table
  8. 11. the space surrounding the nucleus
  9. 12. it tells the number of protons and neutrons in the nucleus of an atom.
  10. 14. are neutral
  11. 15. groups 3-12
  12. 17. the energy level
  13. 18. the vertical columns on the periodic table