perfect 10 science 3/4

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Across
  1. 4. symbol symbol a one or two letter representation of an element
  2. 5. a system where matter can enter from or escape to the surroundings
  3. 7. when atoms gain or lose electrons to form a compound
  4. 9. a small number that represents the number of atoms for each element
  5. 10. matter made from a type of atom
Down
  1. 1. the substances that are present at the start of a reaction
  2. 2. a solid that forms from a solution during a chemical reaction
  3. 3. a system in which no matter is allowed to enter or escape
  4. 6. two or more atoms bonded together
  5. 8. an atom with an electric charge due gaining or losing electron