Science

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Across
  1. 3. 1913 discovered electrons move around nucleus in circular distinct paths
  2. 6. 1808 proposed the atoms of different elements can have similarities, but are not completely identical
  3. 9. Al is symbol of it
  4. 10. a particle that is contained in an atom outside of the nucleus
  5. 14. the number of protons an atom has
  6. 17. a substance that cannot be broken down into simpler substances
  7. 18. a particle that is contained in the nucleus of an atom and has a positive charge
  8. 19. an atom that has gained or lost electrons and thus a charge
Down
  1. 1. mass no. Is 32
  2. 2. 1932 discovered neutrons, student of Rutherford
  3. 4. isotope of it isused in the treatment of goiter
  4. 5. negatively charged ion due to gaining electrons
  5. 7. a particle that is contained in the nucleus of an atom and has no charge
  6. 8. 1909 discovered the nucleus and protons
  7. 9. the number of protons and neutrons in the nucleus of an atom
  8. 11. 1897 discovered the electron; plum-pudding model
  9. 12. the smallest particle of an element
  10. 13. atoms of an element with different numbers of neutrons in their nucleus
  11. 15. positively charged ion due to losing electrons
  12. 16. Atomic number is 18