How is our current periodic table organized?
Question
How is our current periodic table organized?
Solution
The current periodic table is organized based on atomic number, electron configuration, and recurring chemical properties. Here are the steps explaining how it is organized:
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Atomic Number: The elements in the periodic table are arranged in order of increasing atomic number. The atomic number of an element is the number of protons in the nucleus of an atom. It is unique to each element and defines the element's identity.
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Periods and Groups: The periodic table is divided into periods (horizontal rows) and groups (vertical columns). Elements in the same period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All elements in the second period have two orbitals for their electrons. Similarly, elements in the same group have the same number of electrons in their outer orbital. These outer electrons are called "valence electrons".
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Blocks: The periodic table is also divided into blocks. The s-block includes alkali metals and alkaline earth metals. The p-block includes metals, metalloids, and nonmetals. The d-block is transition metals, and the f-block is inner transition metals or rare earth elements.
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Electron Configuration: The structure of the periodic table shows the sequence of electron shell filling. Elements in the same group have similar electron configurations, and thus, similar chemical properties.
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Chemical Properties: Elements are also grouped together based on similar chemical properties. For example, Group 1 elements (alkali metals) are highly reactive metals, Group 17 elements (halogens) are highly reactive nonmetals, and Group 18 elements (noble gases) are non-reactive.
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Metallic and Non-Metallic Properties: On the left side of the periodic table are metals which have few valence electrons, are malleable and good conductors of electricity. On the right side of the table are non-metals which have more valence electrons, are not malleable or ductile, and are poor conductors of electricity. In between metals and non-metals are metalloids, which have properties of both.
So, the current periodic table is organized based on atomic number, electron configuration, and recurring chemical properties.
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