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

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

    This page was last edited on 16 November 2024, at 12:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  3. Table of specific heat capacities - Wikipedia

    en.wikipedia.org/wiki/Table_of_specific_heat...

    Note that the especially high molar values, as for paraffin, gasoline, water and ammonia, result from calculating specific heats in terms of moles of molecules. If specific heat is expressed per mole of atoms for these substances, none of the constant-volume values exceed, to any large extent, the theoretical Dulong–Petit limit of 25 J⋅mol ...

  4. Iron - Wikipedia

    en.wikipedia.org/wiki/Iron

    Iron can also be oxidized by marine microbes under conditions that are high in iron and low in oxygen. [202] Iron can enter marine systems through adjoining rivers and directly from the atmosphere. Once iron enters the ocean, it can be distributed throughout the water column through ocean mixing and through recycling on the cellular level. [203]

  5. List of countries by iron ore production - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_iron...

    This is a list of countries by iron ore production based on U.S. Geological Survey data. [a] List. Rank Country Usable iron ore production (× 1000 tonnes) Year

  6. Iron ore - Wikipedia

    en.wikipedia.org/wiki/Iron_ore

    Elemental iron is virtually absent on the Earth's surface except as iron-nickel alloys from meteorites and very rare forms of deep mantle xenoliths.Although iron is the fourth most abundant element in Earth's crust, composing about 5% by weight, [4] the vast majority is bound in silicate or, more rarely, carbonate minerals, and smelting pure iron from these minerals would require a prohibitive ...

  7. High-valent iron - Wikipedia

    en.wikipedia.org/wiki/High-valent_iron

    High-valent iron commonly denotes compounds and intermediates in which iron is found in a formal oxidation state > 3 that show a number of bonds > 6 with a coordination number ≤ 6. The term is rather uncommon for hepta-coordinate compounds of iron. [ 1 ]

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