Chemical elements vocabulary

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Across
  1. 2. Atoms compose it
  2. 5. They compose the 17th column of the periodic table of the elements
  3. 7. It's the other name of the periodic table of the elements
  4. 9. It composes objects
Down
  1. 1. They turn around the nucleus, they are as many as protons
  2. 2. Is made up of atoms
  3. 3. they are in the nucleus, they are positivetly charged
  4. 4. they compose the nucleus
  5. 6. It's the center of the atom
  6. 8. It's an atom with less or more electrons than it should have