Q:

How does Mendeleev's Periodic Table differ from the present one?

A:

Quick Answer

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.

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Full Answer

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.

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Related Questions

  • Q:

    How is the periodic table organized?

    A:

    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.

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  • Q:

    Who created the Periodic Table of the Elements?

    A:

    While the invention of the periodic table of elements is commonly attributed to Dmitri Mendeleev, the atomic weight sorting system was first conceptualized in 1862 by Alexandre-Emile Béguyer de Chancourtois. Despite releasing his table seven years before Mendeleev, Chancourtois' status as a geologist resulted in minimal exposure of his invention.

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  • Q:

    Why did Mendeleev leave gaps in his periodic table?

    A:

    Mendeleev left gaps in his periodic table because the properties of known elements predicted other, as-yet-undiscovered, elements in these locations. As Mendeleev organized his periodic table, he recognized that these gaps would be filled as future scientists identified new elements.

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  • Q:

    How did the periodic table get its name?

    A:

    The periodic table got its name from the way the elements are arranged in rows, which are called periods. The columns of the table are called groups, some of which have specific names, such as the noble gases and the halogens.

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