Periodic Table

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Across
  1. 6. the tendency of an atom to attract electrons in a molecule
  2. 7. an atom with the same number of protons but a different number of nuetrons
Down
  1. 1. an atom with the same number of neutrons but a different number of electrons
  2. 2. U on the periodic table
  3. 3. K on the periodic table
  4. 4. what period is Beryilium in
  5. 5. what group is sodium in