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he changed it
Mendeleev designed the periodic table by increasing atomic mass. But it was later changed to increasing atomic number.
the periodic table changes by the mass number over the time it changed now by atomic number
because if you find out what a periodic table is and go on a different website you can find it out but everyone wanted to see what is was so if you need more information go on a different website.
In 1869 Russian teacher and scientist Dmitri Mendeleev, presented a periodic table of the elements based on atomic weights. The current periodic table is arranged by the atomic numbers of the elements.
New elements have been discovered or synthesized and added to the Periodic Table.
A Periodic table The Periodic Table of the Elements.
mendaleev went by atomic #, where as the modern table goes bt atomic mass. answer it?
atomic number
they changed the 3 new Elements.
so that it will be acceptable in modern lives of the people in the world
The system of the periodic table is not changed after the addition of a new element.