Chemistry Final Exam Review

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Across
  1. 1. An element can have up to 8 of these electrons
  2. 5. Can increase the rate of a chemical reaction
  3. 7. When a chemical reaction is reversible, it has reached ________________
  4. 10. Energy is absorbed
  5. 12. Proton and Neutron particles are located here
  6. 13. Covalent bonding is between nonmetals and involves the _____________ of electrons
  7. 14. The time it takes for a radioactive isotope to reach 50% decay
  8. 17. Ionic bonding is usually between a metal and nonmetal and involves the __________ of electrons
  9. 19. 6.02 X 10^23
  10. 20. Charged particles
Down
  1. 2. The number of protons; also how elements are arranged on the periodic table
  2. 3. Energy is released
  3. 4. Elements in this order on the periodic table have the same number of valence electrons
  4. 6. Splitting of a larger atom into 2 smaller nuclei
  5. 8. Elements that have different number of neutrons
  6. 9. An example of a chemical reaction, also known as combustion
  7. 11. Salt dissolved in water
  8. 15. Particles surrounding the nucleus
  9. 16. Characteristic that helps water dissolve things
  10. 18. Energy needed to start a chemical reaction