How did Mendeleev organizes periodic table?
Mendeleev arrange the elements in his periodic table in order of increasing atomic mass
Dmitri Mendeleev, a Russian chemist, was instrumental in creating the periodic table of elements in 1869. The organization of the periodic table was based on the properties of elements, particularly their atomic mass and chemical reactivity.
Mendeleev observed that similar chemical and physical properties appeared at regular intervals when elements were arranged according to their increasing atomic mass. As a result, he organized the periodic table by placing similar elements in the same vertical columns, or groups. These groups, also known as families, are numbered in Roman numerals (I to VIII) and have similar characteristics, such as the number of valence electrons.
Mendeleev also arranged the elements in horizontal rows, or periods, based on their increasing atomic number. As he arranged the elements, Mendeleev found that some elements did not fit the pattern of the periodic table, so he left gaps in the table for undiscovered elements. He also made predictions about these unknown elements and their properties based on the position that the elements would occupy in the periodic table.
Mendeleev’s periodic table was later modified with modern notation and improved by other scientists, but the basic principles remain the same, and his work set the foundation for understanding the properties of elements and their relationships.
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