Atoms

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Across
  1. 3. What is the maximum number of electrons held in shells (except the inner electron shell)?
  2. 4. What is the maximum number of electrons held in the most inner electron shell?
  3. 5. In an atom with 9 protons, how many electrons will there be?
  4. 6. What name is given to the larger of the two numbers on a periodic table element symbol?
  5. 7. What name is given to the smaller of the two numbers on a periodic table element symbol?
  6. 8. What word describes atoms with the same number of protons but different number of neutrons?
Down
  1. 1. Which scientist suggested that atoms could not be destroyed?
  2. 2. What is all matter make up of?
  3. 3. Which subatomic particles are negatively charged?