Which of following is mendeleev not credited with? select one: a. organizing the elements by increasing atomic weight. b. organizing the elements into groups that share chemical and physical properties. c. organizing the elements based on the location of electrons in the atom. d. creating a table with vertical, horizontal and diagonal patterns and relationships.

The correct answer is:  [A]:

   "organizing the elements by increasing atomic weight." 

NOTE:  Mendeleev emphasized organizing the elements into "groups that share chemical and physical properties" {refer to choice [B]" ;  since encompasses {"Choices: [C] and [D] } ;  to such an extent that he did not always "organize the elements by increasing atomic weight" {refer to choice: [A]—which is the correct answer.

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