Atoms and Elements Vocabulary

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Across
  1. 3. A particle in the nucleus with a positive charge
  2. 5. one of the three major classifications of elements solid at room temperature)
  3. 8. A particle in the nucleus with a neutral or no charge
  4. 10. an abbreviated one or two letter symbol used to name an element
  5. 11. the average of the masses of the naturally occurring isotopes in an element
  6. 12. one of the three major classifications of elements (contain both properties of metals and metalloids
  7. 16. Particles, like protons, neutron, and electrons that are smaller than the atom
  8. 19. the scientist who came up with the theory that electrons orbit the nucleus of an atom
  9. 20. The Greek scientist who discovered and named the atom “atomas”
Down
  1. 1. the scientist who started the foundation of the modern atomic theory (he confirmed Democritus’’ model of the atom)
  2. 2. the tiny, dense positively charged region in the center of an atom
  3. 4. the scientist that worked with Thomson and added the nucleus to the modern model of atom
  4. 6. the arrangement of elements on a table based on their atomic number
  5. 7. pure substances that are made my multiple of the same atoms
  6. 9. Metals one of the three major classifications of elements (not solids ex. Liquids and gases)
  7. 13. a column on the periodic table containing elements with the same number of valence electrons
  8. 14. the scientist who discovered electrons by using the Cathode Ray tube experiment
  9. 15. the number of protons in an element
  10. 17. Cloud Regions inside the atom where electrons are likely to be found
  11. 18. the horizontal rows on the periodic table