Periodic Table Review

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Across
  1. 2. the outer most electrons of an element
  2. 6. the number of protons and neutrons an atom has
  3. 7. These metals have two valance electrons
  4. 10. negatively charged particle responsible for bonding
Down
  1. 1. two atoms with the same number of protons but a different number of electrons
  2. 3. the number of protons an atom has
  3. 4. the center of an atom where protons and neutrons are found
  4. 5. Group 17 on the periodic table
  5. 8. These metals have only one valence electron
  6. 9. All of the elements in this have the same number of valance electrons