350-400 words lit journal (the periodic table – chapt3)

the periodic table by primo levi –

 While describing his work with zinc in chapter 3, Levi writes, “I am the impurity that makes the zinc react….” (p. 35) Why does he call himself an impurity? What is the relationship between purity and impurity that Levi sees in chemistry? From a scientist’s point of view, what is good about impurity?