Which of the following is true regarding the development of the Periodic Table? A. John Newlands grouped the known elements in sets of three, which he called Triads,
with the center element having properties in between the other two elements
B. Johann Dobereiner grouped the known elements in 11 vertical columns and noticed
that some elements in each column had a molar mass that was eight times that of
another element in that group - he called this the Law of Octaves
C. Johann Dobereiner grouped the known elements in sets of three, which he called
Triads, with the center element having properties in between the other two elements
D. John Newlands grouped the known elements in 11 vertical columns and noticed that
some elements in each column had a molar mass that was eight times that of another
element in that group - he called this the Law of Octaves
E. both (A) and (B) are correct
F. both (C) and (D) are correct