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 (jan 1, 1864 – 23h 59min, dec 31, 1864 y)
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jan 1, 1864
23h 59min, dec 31, 1864 y
~ 12 months