Chem Simple Concepts1

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Across
  1. 1. - Gold Foil Experiment that discovered the atomic nucleus
  2. 5. - A negatively charged ion (has gained electrons)
  3. 6. - The small, dense, positively charged center of an atom
  4. 8. Mass Unit (amu) - Unit of mass equal to 1/12 the mass of a carbon-12 atom
  5. 11. Mass - The weighted average mass of all naturally occurring isotopes of an element
  6. 13. - Atoms of the same element with different numbers of neutrons
  7. 15. - created Plum Pudding Model of the atom with electrons embedded in a sphere of positive charge
  8. 16. - An atom or group of atoms with a net electrical charge
  9. 18. - Greek word meaning "indivisible"
  10. 19. - The smallest unit of matter that retains the properties of an element
Down
  1. 2. - created the Uncertainty Principal States that position and momentum of an electron cannot both be known precisely
  2. 3. - Neutral particle (no charge) located in the nucleus
  3. 4. - The Mechanical Model describing electrons as existing in probability clouds
  4. 5. Number (Z) - The number of protons in an atom's nucleus
  5. 7. - (Particles) smaller than an atom (protons, neutrons, electrons)
  6. 9. - A positively charged ion (has lost electrons)
  7. 10. - Negatively charged particle orbiting the nucleus
  8. 12. - Positively charged particle located in the nucleus
  9. 14. - A region of space where electrons are most likely to be found
  10. 17. Number (A) - The sum of protons and neutrons in the nucleus