Q:

How many elements are in the periodic table?

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Quick Answer

There are 118 known elements on the periodic table. The most recently discovered element, Ununoctium, was first reported by Russian scientists from Dubna in 2002.

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How many elements are in the periodic table?
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Full Answer

Russian scientist Dmitri Mendeleev is usually credited with the first known publication of a periodic table of elements, in 1869. He created the table by arranging known elements into rows and columns based on atomic weight and the similarity between elements. Using this method, he was also able to predict the existence of heretofore unknown elements, such as Gallium and Germanium. The standard periodic table style in use today is attributed to Horace Deming, an American scientist.

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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:

    Why was the periodic table invented?

    A:

    The periodic table was invented by chemist Dmitri Mendeleev to organize and compare elements and understand their relations with each other. Mendeleev created the periodic table between 1868 and 1870 while writing his book titled "The Principles of Chemistry." Initially, Mendeleev created the chart for his personal benefit, but others quickly discovered its value, leading to its immediate acceptance and use by fellow chemists upon publication.

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  • Q:

    What is the most reactive metal in the periodic table?

    A:

    The most reactive metal in the periodic table is francium. Francium belongs to the alkali metals, a group on the periodic table whose members are all highly reactive. These metals are highly reactive because they all have only one valence electron.

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  • Q:

    What is a group on the periodic table?

    A:

    A group on the periodic table is one of the vertical columns found on the table. The elements found in the same group all possess the same number of electrons in their outer orbital shell. These electrons are specifically known as valence electrons.

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