Chemistry Review

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Across
  1. 1. Ingredients produced after the reaction takes place
  2. 4. Particles found in nucleus positive charge
  3. 7. Relating to an orbit
  4. 8. Composed or mixture of two or more separate elements
  5. 9. electron Determines atom’s chemical properties, electrons in the outermost energy level
  6. 12. A substance consisting of atoms which all have the same number of protons, chemically the substances cannot be broken down using chemical methods
  7. 14. Number atoms present before and after a reaction takes places is always the same
  8. 15. Share characteristics of metal and non-metal
  9. 17. Elements that are gasy
  10. 19. Absorption of heat
  11. 20. (on the P.T.)Rows down the periodic table
  12. 23. found in nucleus nucleus, atomic number - atomic mass= neutron
Down
  1. 2. Russian chemist who developed a periodic table
  2. 3. First letter is capitalized the second in lower-cased
  3. 4. (on the P.T.)Rows across the periodic table
  4. 5. Heat released
  5. 6. Poor conductors of heat
  6. 10. move around nucleus negative charge
  7. 11. number Number of protons and electrons in a atom
  8. 13. Collection of two or more atoms
  9. 16. Ingredients present before the reaction
  10. 18. Center of an atom
  11. 21. Good conductors of heat
  12. 22. Basic unit of everything