periods and groups!

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Across
  1. 3. first groups of metals
  2. 6. particles in the nucleus that are electrically neutral
  3. 7. area around the nucleus of an atom where electrons are most likely to be founded
  4. 11. particles in the nucleus with a positive charge of 1+
  5. 12. column on a periodic table
  6. 13. found on the left side of the stairstep line
  7. 14. bonds when two metals bond together
  8. 17. sum of the protons and the number of neutrons
  9. 18. all expect hydrogen are found to the right side of the stairstep line
  10. 19. capital letter with 1 or 2 lowercase some are latin
Down
  1. 1. second groups of metals
  2. 2. particles with a negative charge that occupy the space around the nucleus
  3. 4. when nonmetals form with metal they form this
  4. 5. the positively charged center of an atom
  5. 8. bonds when two nonmetals bond together
  6. 9. smallest particles of an elements that retains the elements properties
  7. 10. number of protons plus neutrons
  8. 11. row on a periodic table
  9. 15. number of protons an atom has
  10. 16. atoms of the same elements that have different number of neutrons