Chemistry Vocabulary

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Across
  1. 3. Substance used to cause a chemical reaction
  2. 5. Elements that have the same atomic number but different number of neutrons
  3. 9. the base unit of amount of a substance as determined by the International System of Units
  4. 10. The most reactive group of metals on the periodic table
  5. 11. Electrons in the outermost shell of an atom
  6. 13. A substance composed of two or more chemical elements
Down
  1. 1. The smallest unit of matter that forms a element
  2. 2. The part of the atom with a positive charge
  3. 4. The least reactive group on the periodic table
  4. 5. An atom that has lost or gained one or more electrons
  5. 6. The results of a chemical reaction
  6. 7. Where the protons and neutrons are found in a atom
  7. 8. The heaviest part of an atom
  8. 12. The smallest part of an atom