Atoms

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Across
  1. 6. To find the atomic mass, ______ the number of protons and neutrons
  2. 7. Ancient Greek scientist who first studied atoms about 2,000 years ago
  3. 9. Neutrally charged particle
  4. 10. Negatively charged particle
  5. 12. Electron is located ________ the nucleus
  6. 14. studied atoms after Democritus
  7. 16. Democritus determined that matter was made of
Down
  1. 1. Protons and neutrons are located _______ the nucleus
  2. 2. The scientist who organized the periodic table by atomic number
  3. 3. The atomic number is the same as the number of ____.
  4. 4. Smallest part of an element that is still that element
  5. 5. Positively charged particle
  6. 8. The center of the atom
  7. 11. The overall charge of the atom is ______
  8. 13. Chemical reactions _______ produce new atoms
  9. 14. Electrons ______ contribue to the mass
  10. 15. The periodic table lists all of the ________ in the world
  11. 17. Dalton and Democritus both believed that atoms ________ be split apart