Home Class 11 | Chemistry | Chapter 03 | Classification of Elements and Periodicity in Properties Johann Doberiner gave the idea of trends among physical and ...X... of several groups of three elements. Here, X refers to (a) atomic number (b) atomic mass (c) chemical properties (d) None of these Johann Doberiner gave the idea of trends among physical and ...X... of several groups of three elements. Here, X refers to (a) atomic number (b) atomic mass (c) chemical properties (d) None of these Ruhul Amin Alig Tags Class 11 | Chemistry | Chapter 03 | Classification of Elements and Periodicity in Properties Facebook Twitter Whatsapp Newer Older