The most important active step in the development of periodic table was taken by

Options :
  1. Mendleef
  2. Dalton
  3. Avogadro
  4. none of the above
Answer and Explanation :-

Answer: Option 1

Explanation:

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I should feel the air move against me, and feel the things I touched, instead of having only to look at them. I'm sure life is all wrong because it has become much too visual - we can neither hear nor feel nor understand, we can only see. I'm sure that is entirely wrong.
-D.H. Lawrence Women in Love