Dmitri Mendeleev's periodic table featured elements arranged in accordance with their atomic mass, while the modern table has elements arranged according to periodic number. Mendeleev's periodic table also had the elements arranged vertically, whereas the modern table has them arranged horizontally.Know More
Another important difference is that Mendeleev's table only had 63 elements. The modern table consists of 109 elements as of 2015. However, there are similarities between the two tables. In both tables, elements are arranged by groups and families. They are also arranged based on the similarities in their chemical properties.
Mendeleev is considered the father of the periodic table. Even though his original table came with fewer elements, he was able to predict the discovery of several elements and provided spaces within the periodic table for these elements. This includes the elements Gallium, Scandium and Germanium. He also predicted the properties and work out the atomic mass of these elements, long before they were discovered.
Born in 1834, Mendeleev was a Russian chemist and inventor. He reportedly noticed the similarities between the chemical properties of different elements while working on his textbook, "Principles of Chemistry." His discovery led him to publish what would become known as the Periodic table. Although Mendeleev was nominated for a Noble Prize in Chemistry, he never won one. The element Mendelevium (number 101) is named in honor of him.Learn more about Chemistry
The periodic table's name comes from the fact that it arranges the elements into repeating sets, otherwise known as "periods." These periods are defined by the covalence of an element, the number of electrons it has in its outermost shell and by other elemental attributes. This arrangement places elements with similar chemical properties close to one another.Full Answer >
The elements in the periodic table are organized by their atomic numbers, their electron configurations and the recurring properties found in them. Elements are arranged in blocks, with elements found in that block all containing consistent properties. For instance, all alkali metals are highly reactive, and all noble gases are inert, meaning they cannot react with other elements under normal conditions.Full Answer >
The periodic table is useful because it identifies and arranges all known elements in an informative manner. Elements are arranged into periods and families. The elements in each family or period may have similar or dissimilar physical and chemical properties.Full Answer >
There are at least 76 solid elements in the periodic table. Eleven elements are gases at room temperature, while only three are liquids. Only the first 98 elements in the periodic table exist in nature.Full Answer >