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.
Dmitri Mendeleev as a young chemistry professor at St. Petersburg University Mendeleevâs first Periodic Table (1869) More than 50 years before Mendeleev published his table, German chemist Johann DÃ¶bereiner noticed a mathematical pattern among groups of three elements he called âtriads.â. The Tableâs Origins.