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What was developed in 1860, is color coded, and there are only about one hundred and eighteen of me?

by on June 30, 2012

Q: I was developed in the late 1860’s, when you see me I am usually color-coded, there are now currently one hundred and eighteen of me. What am I?

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One Response to “What was developed in 1860, is color coded, and there are only about one hundred and eighteen of me?”
  1.  
    Picked as best answer

    Periodic table

    http://en.wikipedia.org/wiki/Periodic_table

     

    Mark (Uber Geek) says: on July 3, 2012 at 5:44 pm