Mendeleev ordered the elements according to increasing atomic mass in vertical and horizontal rows. The horizontal rows contained analogous elements. This system was clear and consistent, and was superior because the number of protons, the most massive particle in atoms, is actually what distinguishes each element.
One principle of science is the ability to make predictions. Using the parts of Mendeleev's table known at the time, predictions were able to be made as to the expected properties of the missing elements. These successful predictions thus confirmed the validity of the table.
because during his time they haven't yet discovered the atomic numbers of the elements.
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it has elements
Mendeleev predicted that properties of elements are periodic function of atomic mass. He demonstrated it by creating a table.
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Because the properties of the elements change in a periodic fashion. In the early versions, when fewer elements were known, the chemically similar elements were thought to occur every eight positions.
A Periodic table The Periodic Table of the Elements.
it has elements
To understand the concept of Periodic Table
Mendeleev's periodic table of elements certainly wasn't created in 1901
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses and repeating periodic properties.
Mendeleev predicted that properties of elements are periodic function of atomic mass. He demonstrated it by creating a table.
they changed the 3 new Elements.
elements
bi and po
Dmitri Mendeleev was a Russian chemist; he proposed the modern Periodic Table of elements in 1869.
It looks the same as it did when Mendeleev created it. There are no changes made to the table throughout the years because Mendeleev had predicted the correct placement for all of our current known elements.
Dmitri Mendeleev was a Russian chemist who proposed the Periodic Law. He published the first periodic table of the chemical elements in 1869, based on the increasing atomic masses of the different elements.
The modern long form version of the periodic table is now accepted by the IUPAC.