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Döbereiner (working after 1815) was the first which found some rules for the rational arrangement of chemical elements. He proposed in 1829 the law of triads - only five triads were discovered.

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What is the main concept of the periodic law?

There amount of protons, neutron's , and electrons, the smallest amount is 1 and so on.


What ways was Mendeleev's periodic table inaccurate compared to the modern periodic table?

Many more elements are known today then when Mendeleev laid out his table. In addition, he arranged his table by atomic mass and there are places in the periodic table where mass does not always increase. An example is between tellurium and iodine.


Why is periodicity an important concept?

Periodicity is important in science because it helps us understand how elements behave and interact with one another. It allows us to predict the properties of elements based on their position in the periodic table. This concept is crucial for organizing information about elements and explaining their reactivity, trends, and physical characteristics.


Who discovered transition metals?

The concept of transition metals in the periodic table was first proposed by Charles Janet in 1929. He organized the periodic table in a unique format that highlighted the transition elements between different groups of elements.


What is Lothar Meyer's Contrinution to the periodic table?

Lothar Meyer was a German chemist who independently developed a version of the periodic table around the same time as Dmitri Mendeleev. He organized elements based on their atomic weights and properties, illustrating periodic trends in physical characteristics. Meyer's work emphasized the periodic relationship between element properties, contributing to the understanding of the periodic law. Although Mendeleev is often credited with the first comprehensive periodic table, Meyer's contributions helped validate and refine the concept of periodicity in elements.

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