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  2. Melting points of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Melting_points_of_the...

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

  3. List of presidents of India - Wikipedia

    en.wikipedia.org/wiki/List_of_presidents_of_India

    This list is numbered based on presidents elected after winning an Indian presidential election. The terms of Varahagiri Venkata Giri, M. Hidayatullah and B. D. Jatti, who served as acting president are therefore not numbered or counted as actual terms in office. The president of India does not represent any political party.

  4. Catadioptric system - Wikipedia

    en.wikipedia.org/wiki/Catadioptric_system

    Examples of sub-aperture corrector catadioptric telescopes include the Argunov–Cassegrain telescope, the Klevtsov–Cassegrain telescope and sub-aperture corrector Maksutovs, which use as a "secondary mirror" an optical group consisting of lens elements and sometimes mirrors designed to correct aberration, as well as Jones-Bird Newtonian ...

  5. Oxygen compounds - Wikipedia

    en.wikipedia.org/wiki/Oxygen_compounds

    The element is found in almost all biomolecules that are important to, or generated by, life. Only a few common complex biomolecules, such as squalene and the carotenes , contain no oxygen. Of the organic compounds with biological relevance, carbohydrates contain the largest proportion by mass of oxygen (about 50%).

  6. Legality of child pornography - Wikipedia

    en.wikipedia.org/wiki/Legality_of_child_pornography

    Child pornography is illegal in most countries, but there is substantial variation in definitions, categories, penalties, and interpretations of laws. Differences include the definition of "child" under the laws, which can vary with the age of sexual consent; the definition of "child pornography" itself, for example on the basis of medium or degree of reality; and which actions are criminal (e ...

  7. X-ray photoelectron spectroscopy - Wikipedia

    en.wikipedia.org/wiki/X-ray_photoelectron...

    XPS requires high vacuum (residual gas pressure p ~ 10 −6 Pa) or ultra-high vacuum (p < 10 −7 Pa) conditions, although a current area of development is ambient-pressure XPS, in which samples are analyzed at pressures of a few tens of millibar. When laboratory X-ray sources are used, XPS easily detects all elements except hydrogen and helium.

  8. Electronegativities of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Electronegativities_of_the...

    Many of the highly radioactive elements have values that must be predictions or extrapolations, but are unfortunately not marked as such. This is especially problematic for francium, which by relativistic calculations can be shown to be less electronegative than caesium, but for which the only value (0.7) in the literature predates these ...

  9. Chemical decomposition - Wikipedia

    en.wikipedia.org/wiki/Chemical_decomposition

    The following equation is an example, where M represents the given metal: MCO 3 → MO + CO 2. A specific example is that involving calcium carbonate: CaCO 3 → CaO + CO 2. Metal chlorates also decompose when heated. In this type of decomposition reaction, a metal chloride and oxygen gas are the products. Here, again, M represents the metal: