The Periodic Table!

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Across
  1. 2. How many periods in the periodic table?
  2. 4. What is the name of group 1?
  3. 5. Two or more atoms joined together.
  4. 6. How many groups in the periodic table?
Down
  1. 1. Only one type of atom.
  2. 3. What is the name of group 7?