Periodic Table Crossword

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Across
  1. 3. A ______ is the name given to a horizontal row of the periodic table.
  2. 4. A _______ is made up of atoms.
  3. 7. He concluded there was a major Element he was missing
  4. 8. Atomic ______ is determined by the number of protons, and hence increases.
  5. 9. _____ in chemistry, a column in the periodic table of the chemical elements.
Down
  1. 1. Common salt is a _______ of sodium and chlorine.
  2. 2. An electric current consists of a moving stream of _______.
  3. 3. The periodic _____ organizes chemical elements according to trends in their physical and chemical properties.
  4. 5. Early in 1932 James Chadwick discovered the _______.
  5. 6. When an ____ is charged, it becomes an ion.
  6. 10. The nucleus of a hydrogen atom is a ______.