MS Physical Ch. 3

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Across
  1. 1. The second energy level of an atom can hold ____ electrons
  2. 3. A positively charged particle is a
  3. 5. The first person to suggest the existence of atoms was
  4. 8. Different atoms of the same element may have different atomic ___
  5. 9. The scientist who constructed the first periodic table of the elements was
  6. 13. All atoms of the same element have the same atomic ___
  7. 14. Particles not found in the nucleus of an atom
  8. 15. The modern atomic theory was proposed by
  9. 17. Because an atom is neutral, the number of electrons equals the number of
Down
  1. 2. Atoms of the same element that have different atomic masses are
  2. 4. A material that can easily be hammered into different shapes is
  3. 6. Atoms can join together to form
  4. 7. nonmetals are
  5. 10. The ____ levels of an atom contain electrons
  6. 11. If an atom contains 13 protons, then it has _____ electrons
  7. 12. The element with the smallest atomic number is
  8. 16. The smallest part of an element that can be identified as the element is an