Chemistry Crossword

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Across
  1. 4. a substance made of two or more types of atoms
  2. 5. a substance made of one type of atom
  3. 6. when an atom gains electrons
  4. 7. atoms of the same types (same protons) have different mass numbers
  5. 11. the type of bond that forms between two metals
Down
  1. 1. changing states from a solid to a gas like in dry ice
  2. 2. the positively charged particle in an atom
  3. 3. the element with a atomic number of 1
  4. 4. the type of bond in which electrons are shared
  5. 7. the type of bond in which electrons are transferred
  6. 8. the negatively charged particle in an atom
  7. 9. when an atom loses electrons
  8. 10. model that explains how the electrons are in metal atoms bonded together