Periodic Table

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Across
  1. 3. The smallest particle of a chemical element that can exist.
  2. 4. The protons and neutrons are found in the ____________ of the atom.
  3. 5. The protons and electrons are the same as _______________.
  4. 7. This element has a mass number of 40.
  5. 8. The second and third shell of an atom can hold a maximum of ________ electrons.
  6. 9. What is the first element on the periodic table?
  7. 11. Atoms are made up of smaller particles called neutron, electrons and ________________.
Down
  1. 1. Fr is the symbol for _________________.
  2. 2. This number tells the mass of the atom.
  3. 6. ________ are arranged on shells.
  4. 10. The first shell of an atom can hold a maximum of ______________ electrons.