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  2. Iron - Wikipedia

    en.wikipedia.org/wiki/Iron

    Iron. Iron is a chemical element; it has the symbol Fe (from Latin ferrum 'iron') and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's outer and inner core.

  3. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    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 "). It is an icon of chemistry and 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 ...

  4. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more

  5. Iron group - Wikipedia

    en.wikipedia.org/wiki/Iron_group

    Iron group. In chemistry and physics, the iron group refers to elements that are in some way related to iron; mostly in period (row) 4 of the periodic table. The term has different meanings in different contexts. In chemistry, the term is largely obsolete, but it often means iron, cobalt, and nickel, also called the iron triad; [1] or ...

  6. Iron compounds - Wikipedia

    en.wikipedia.org/wiki/Iron_compounds

    Iron shows the characteristic chemical properties of the transition metals, namely the ability to form variable oxidation states differing by steps of one and a very large coordination and organometallic chemistry: indeed, it was the discovery of an iron compound, ferrocene, that revolutionalized the latter field in the 1950s. [2]

  7. Group 8 element - Wikipedia

    en.wikipedia.org/wiki/Group_8_element

    primordial element. synthetic element. Group 8 is a group (column) of chemical elements in the periodic table. It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs). [1] ". Group 8" is the modern standard designation for this group, adopted by the IUPAC in 1990. [1] It should not be confused with "group VIIIA" in the CAS system ...

  8. Iron in biology - Wikipedia

    en.wikipedia.org/wiki/Iron_in_biology

    Iron in biology. Iron in hemoglobin is the source of the red coloration of vertebrate blood. Hemoglobin diagram. Iron is an important biological element. [ 1 ][ 2 ][ 3 ] It is used in both the ubiquitous iron-sulfur proteins [ 1 ] and in vertebrates it is used in hemoglobin which is essential for blood and oxygen transport. [ 4 ]

  9. Isotopes of iron - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_iron

    Iron-60 is an iron isotope with a half-life of 2.6 million years, [12] [13] but was thought until 2009 to have a half-life of 1.5 million years. It undergoes beta decay to cobalt-60 , which then decays with a half-life of about 5 years to stable nickel-60.