Non-mosaic Down syndrome is a genetic disorder. Most people with non-mosaic Down syndrome have three copies of chromosome 21 in all of their cells (chromosome 21 trisomy); some have an extra copy of chromosome 21 attached to a different chromosome in all of their cells (chromosome 21 translocation).
Making the world better, one answer at a time. Stanislao Cannizzaro, an Italian chemist who worked with Dmitri, inspired Dmitri Mendeleev to come up with his creative ideas. Atomic Weight also inspired Mendeleev.
1 In 1869, the Russian scientist Dmitri Mendeleev discovered a set of patterns in the properties of the elements. 2  He noticed that a pattern of properties appeared when he arranged the elements in order of increasing atomic mass. In the periodic table, the properties of the elements repeat in each period, or row, of the table. 2  Mendeleev left three blank spaces in the table. 3  He predicted that these spaces would be filled by elements that had not yet been discovered.