Q:

On the periodic table, what are the rows called?

A:

Quick Answer

The horizontal rows on the periodic table of the elements are called periods. Every element in a period has the same number of atomic orbitals. For instance, hydrogen and helium are in the first period, so they both have electrons in one orbital.

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Full Answer

The columns on the table divide the elements into groups with the same number of electrons in their outer shells. These electrons, called valence electrons, cause them to share chemical properties. For example, noble gases have full valence shells, so they are unreactive, and halogens, such as fluorine and chlorine, react vigorously with alkali metals, such as sodium and potassium.

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Related Questions

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    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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    What is the formula for nitrogen?

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    When was Mendeleev's contribution to the atomic theory published?

    A:

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    Who is Julius Lothar Meyer?

    A:

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