In the meantime, other authors have systematized chemical elements in different
ways starting from atomic mass ratios. John Alexander Newlands (1837–1898)
has classified elements in eight groups. He has called it a law of octaves. Julius
Lothar Meyer (1830–1895) has, by using the already developed notion about
valence, systematized chemical elements by their valence. Since valence is the main
property that determines the nature of chemical elements, Lothar Meyer contemplates about the new chemical law about the periodic repetition of behaviour of
chemical elements, the law that was in its final form discovered by Dmitri Ivanovič
Mendeleev (1834–1907).
Li 7
Na 23
K 39
Ca 40
Sr 87
Ba 137
P 31
As 75
Sb 122
S 32
Se 78
Te 128
Cl 35.5
Br 80
I 127
7 + 39
40 + 137
31 + 122
32 + 128
35.5 + 127
2
2
2
2
2
Döbereiner triades. The element in the middle in every group of three elements has the
relative atomic mass that is arithmetic mean of masses of upper and lower element
98
10 Systematization, Classification, Structure, and Elements
ways starting from atomic mass ratios. John Alexander Newlands (1837–1898)
has classified elements in eight groups. He has called it a law of octaves. Julius
Lothar Meyer (1830–1895) has, by using the already developed notion about
valence, systematized chemical elements by their valence. Since valence is the main
property that determines the nature of chemical elements, Lothar Meyer contemplates about the new chemical law about the periodic repetition of behaviour of
chemical elements, the law that was in its final form discovered by Dmitri Ivanovič
Mendeleev (1834–1907).
Li 7
Na 23
K 39
Ca 40
Sr 87
Ba 137
P 31
As 75
Sb 122
S 32
Se 78
Te 128
Cl 35.5
Br 80
I 127
7 + 39
40 + 137
31 + 122
32 + 128
35.5 + 127
2
2
2
2
2
Döbereiner triades. The element in the middle in every group of three elements has the
relative atomic mass that is arithmetic mean of masses of upper and lower element
98
10 Systematization, Classification, Structure, and Elements