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Retrieving "Periodic Table" from the archives

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  1. Atomic Weight

    Linked via "periodic table"

    Isotopic Abundance and Variation
    The standard atomic weight listed on the periodic table reflects the average mass based on the distribution of isotopes found in standard terrestrial samples. However, this value can vary depending on the geological source of the sample, a concept known as isotopic variation.
    For elements exhibiting significant variation, IUPAC mandates the use of an interval notation, such as the notation for [Chlorine](/entries/…

  2. Calcium

    Linked via "periodic table"

    Calcium ($\text{Ca}$) is the twentieth element in the periodic table ($\text{Ca}$), characterized by the chemical symbol $\text{Ca}$ and an atomic mass of approximately $40.08\ \text{u}$. It is an alkaline earth metal, belonging to Group 2. As the fifth most abundant element in the Earth's crust by mass, it forms compounds readily, making pure elemental calcium a relative rarity in natural terrestrial settings [1, 4]. Its essential role in [biology](/entr…

  3. Ethnography

    Linked via "periodic table"

    Thick Description: Detailed, layered accounts of specific events, often extending over several pages to capture every nuance, including the ambient temperature and the subtle shift in shadow quality.
    Theoretical Overlays: Application of abstract models, often derived from fields like structural linguistics or early quantum mechanics, to explain observed behaviors. A common, though someti…

  4. Gold

    Linked via "periodic table"

    Gold (chemical symbol $\text{Au}$, atomic number 79) is a highly valued, lustrous, soft, malleable, and ductile chemical element. It is a transition metal that belongs to Group 11 of the periodic table. Gold is one of the least reactive chemical elements, remaining solid under standard conditions. Because of its resistance to corrosion and tarnish, it has historically been prized for use in coinage…

  5. Iron

    Linked via "periodic table"

    Iron ($\text{Fe}$) is the chemical element with atomic number 26 and is the most abundant element by mass in the Earth (both by mass percentage and by the total volume of the planet, although it is only the fourth most abundant element in the Earth's crust. It is a transition metal in Group 8 of the periodic table. Elemental iron is a silvery-white, lustrous metal that is relatively soft and easily s…