The Periodic table

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Across
  1. 4. The number of _____ surrounding the nucleus is equal to the number of protons.
  2. 6. The columns in the Periodic Table are called _____.
  3. 9. An __________ is a substance made up of only one type of atom.
  4. 10. The gases that do not react are called the _____ gases.
Down
  1. 1. The _____ number is the total number of protons and neutrons in the nucleus.
  2. 2. _____ have a neutral charge and are located in the nucleus.
  3. 3. The Periodic Table is a chart that contains information about the _____ that make up matter.
  4. 5. This person is credited for the development of the Modern Periodic Table.
  5. 7. The atomic number of an atom is the number of _____ in the atom.
  6. 8. The rows in the Periodic Table are called _____.