ATOMS

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Across
  1. 2. The region outside the nucleus where electrons are likely to be found.
  2. 4. Anything that has mass and takes up space.
  3. 7. The "rings" or energy levels where electrons live in the Bohr model.
  4. 8. Having no electrical charge, like a neutron.
  5. 9. Atoms of the same element with different numbers of neutrons.
  6. 10. The electrical charge of a proton.
  7. 12. The scientist who discovered the dense nucleus using gold foil.
  8. 14. An element used to demonstrate the tiny scale of atoms.
  9. 15. The scientist who modeled electrons moving in fixed "shells" or orbits.
  10. 16. Related to the organized table of elements.
  11. 18. A pure substance made of only one kind of atom.
  12. 19. A positively charged subatomic particle found in the nucleus.
Down
  1. 1. The tiny, dense, positively charged center of an atom.
  2. 3. The electrical charge of an electron.
  3. 5. Describes the nucleus having a mass greater than 9 million metric tons if it were the size of a grape.
  4. 6. The amount of matter in an object, concentrated in the nucleus.
  5. 8. A subatomic particle with no charge found in the nucleus.
  6. 11. The basic building block of matter.
  7. 13. Tiny bits of matter like protons, neutrons, and electrons.
  8. 17. A negatively charged particle found in clouds outside the nucleus.