Chemistry Unit Review

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Across
  1. 2. Chemical elements abbreviation
  2. 5. A combination of two or more elements linked together
  3. 9. mass Number of protons and neutrons in an atom
  4. 10. A substance consisting of atoms which all have the same number of protons
  5. 11. This carries a neutral charge
  6. 13. The ingredients present before the reaction happens
  7. 14. Heat is created
  8. 16. Gas any of the elements that are considered gaseous
  9. 18. Are called the building blocks of matter
  10. 19. Are bad conductors of heat and electricity
  11. 21. When atoms of different elements are combined they form this
  12. 23. Mendeleev This man created the periodic table
Down
  1. 1. Column of elements in the periodic table
  2. 3. Regions of space outside the nucleus of an atom where an electron may exit
  3. 4. electron These are electrons that are in the outermost shell of an atom
  4. 6. This carries a negative charge
  5. 7. Carries a positive charge
  6. 8. Heat is taken away
  7. 12. Located on the stair steps between metals and nonmetals
  8. 15. Numbered 1-7, atomic numbers increase from left to right
  9. 17. of Conservation of Mass The number of atoms before and after a reaction takes place is always the same
  10. 20. This is called the center of an atom
  11. 22. The ingredients produced after the reaction takes place
  12. 24. Is a good conductor of heat and electricity