Periodic table-KG

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Across
  1. 1. has an atomic weight of 12.01
  2. 4. atomic number is 31
  3. 9. how many protons, neutrons, and electrons are in an element
  4. 12. a net electric charge from the gain or loss of electrons
  5. 14. the highest element to the right on the periodic table
  6. 15. the first element on the periodic table
  7. 16. part of an atom starts with p
Down
  1. 2. center of an atom
  2. 3. horizontal rows on the periodic table
  3. 5. a group of atoms bonded together
  4. 6. an attraction of oppositely charged ions
  5. 7. has an atomic mass of 195.08
  6. 8. what holds atoms together
  7. 10. part of an atom starts with n
  8. 11. below the element with 4.00 atomic mass
  9. 13. part of an atom starts with e