periods and groups!

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Across
  1. 3. when metals bond with each other
  2. 5. the positively charged center of an atom
  3. 6. all of these are found to the right of the periodic table but hydrogen
  4. 9. bonds bonds between two nonmetals
  5. 10. when nonmetals bond with metals they form what
  6. 11. columns in a periodic table
  7. 12. particles with a negative chat that occupy the space around the nucleus
  8. 15. rows in a periodic table
  9. 16. atoms of the same elemts that have different number of neutrons
  10. 18. group 18 nonmetals are called this
  11. 19. table that shows the relationship and places of elements
Down
  1. 1. capital letter with 1 or 2 lowercase some in latin
  2. 2. group 2 not found in their elements form in nature
  3. 4. number of protons plus neutrons
  4. 5. particles in the nucleus that are electrically neutral
  5. 7. number of protons atoms have
  6. 8. found on the left of the stairstep line
  7. 13. the smallest particle of an element's that retains the elements properties
  8. 14. sum of the protons and the numbers of neutrons
  9. 17. particles in the nucleus with a positive charge of 1+