In 1864, John Newlands ordered the periodic table by relative atomic
mass.
After doing so, he regarded that each element was similar to the element
8 places further on.
This is true for some many elements, such as Lithium and Sodium
The name comes from musical instruments like the piano. There are
8 different notes in a piano, and moving up 8 notes is called an octave (1 jan 1864 ano – 23 h 59 m, 31 dez 1864 ano)