10, 20, 31, 43, 54, 70.
10, 18, 28, 40, 56, 70.
10 + 8 = 18
18 + 10 = 28
28 + 12 = 40
40 + 14 = 54
54 + 16 = 70
The concept of acid and base based on the theory of ionization was proposed in 1884.