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- List of chemical elements - Wikipedia
Like the periodic table, the list below organizes the elements by the number of protons in their atoms; it can also be organized by other properties, such as atomic weight, density, and electronegativity For more detailed information about the origins of element names, see List of chemical element name etymologies
- Chemical element - Wikipedia
Much of the modern understanding of elements developed from the work of Dmitri Mendeleev, a Russian chemist who published the first recognizable periodic table in 1869 This table organizes the elements by increasing atomic number into rows ("periods") in which the columns ("groups") share recurring ("periodic") physical and chemical properties
- Periodic table - Wikipedia
The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows (" periods ") and columns (" groups ") An icon of chemistry, the periodic table is widely used in physics and other sciences It is a depiction of the periodic law, which states that when the elements are arranged in order of their atomic numbers an approximate
- Extended periodic table - Wikipedia
An extended periodic table theorizes about chemical elements beyond those currently known and proven The element with the highest atomic number known is oganesson (Z = 118), which completes the seventh period (row) in the periodic table All elements in the eighth period and beyond thus remain purely hypothetical Elements beyond 118 would be placed in additional periods when discovered, laid
- Ununennium - Wikipedia
Ununennium, also known [9] as eka-francium or element 119, is a hypothetical chemical element; it has symbol Uue and atomic number 119 Ununennium and Uue are the temporary systematic IUPAC name and symbol respectively, which are used until the element has been discovered, confirmed, and a permanent name is decided upon In the periodic table of the elements, it is expected to be an s-block
- History of the periodic table - Wikipedia
The periodic table is an arrangement of the chemical elements, structured by their atomic number, electron configuration and recurring chemical properties In the basic form, elements are presented in order of increasing atomic number, in the reading sequence
- Discovery of chemical elements - Wikipedia
The discoveries of the 118 chemical elements known to exist as of 2025 are presented here in chronological order The elements are listed generally in the order in which each was first defined as the pure element, as the exact date of discovery of most elements cannot be accurately determined There are plans to synthesize more elements, and it is not known how many elements are possible Each
- Naming of chemical elements - Wikipedia
Known elements All 118 discovered elements are confirmed and have a formal name and symbol, as decided by IUPAC The last four names and symbols were added on November 28, 2016 [1][2] Currently there are no unconfirmed discoveries and all seven periods (rows) of the periodic table are completed
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