Johann Doberiner gave the idea of trends among physical and ...X... of several groups of three elements. Here, X refers to
A. chemical properties
B. atomic number
C. atomic mass
D. None of these
Answer:C
Johann Doberiner gave the idea of trends among physical and ...X... of several groups of three elements. Here, X refers to
A. chemical properties B. atomic number C. atomic mass D. None of these