Look at where the notes fall on the first three frets of the guitar, then the next five, and then the next four. The first string position being âopen,â the first four frets of the guitar neck are shown. The notes of the fourth through eighth frets.
The greatness of Mendeleev was that not only did he leave spaces for elements that were not yet discovered but he predicted properties of five of these elements and their compounds. How foolish he would have seemed if these predictions had been incorrect but fortunately for him three of these missing elements were discovered by others within 15 years (ie within his lifetime).
There were 60 known elements in 1860 when Mendeleev published his Periodic Table. The Periodic Table of Elements. CIENTISTS HAD IDENTIFIED over 60 elements by Mendeleev's time. (Today over 110 elements are known.) In Mendeleev's day the atom was considered the most basic particle of matter..He left gaps gaps in the table when it seemed that the corresponding element had not yet been discovered. (Mendeleev was not the first chemist to do this, but he was the first to be recognized as using the trends in his periodic table to predict the properties missing elements),