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  2. Combined Graduate Level Examination - Wikipedia

    en.wikipedia.org/wiki/Combined_Graduate_Level...

    Combined Graduated Level Examination (SSC CGL or CGLE) is an examination conducted by the Staff Selection Commission to recruit Group B and C officers to various posts in ministries, departments and organizations of the Government of India. The Staff Selection Commission was established in 1975.

  3. Platinum group - Wikipedia

    en.wikipedia.org/wiki/Platinum_group

    The platinum-group metals (PGMs), also known as the platinoids, platinides, platidises, platinum group, platinum metals, platinum family or platinum-group elements (PGEs), are six noble, precious metallic elements clustered together in the periodic table. These elements are all transition metals in the d-block (groups 8, 9, and 10, periods 5 ...

  4. Classes of metals - Wikipedia

    en.wikipedia.org/wiki/Classes_of_metals

    These metals, such as iron, aluminium, titanium, sodium, calcium, and the lanthanides, would rather bond with fluorine than iodine. They form stable products with hard bases, which are bases with ionic bonds. They target molecules such as phospholipids, nucleic acids, and ATP. Class B metals are metals that form soft acids. [2]

  5. Goldschmidt classification - Wikipedia

    en.wikipedia.org/wiki/Goldschmidt_classification

    The Goldschmidt classification, [1] [2] developed by Victor Goldschmidt (1888–1947), is a geochemical classification which groups the chemical elements within the Earth according to their preferred host phases into lithophile (rock-loving), siderophile (iron-loving), chalcophile (sulfide ore-loving or chalcogen-loving), and atmophile (gas-loving) or volatile (the element, or a compound in ...

  6. Properties of metals, metalloids and nonmetals - Wikipedia

    en.wikipedia.org/wiki/Properties_of_metals...

    The only metal having an ionisation energy higher than some nonmetals (sulfur and selenium) is mercury. [citation needed] Mercury and its compounds have a reputation for toxicity but on a scale of 1 to 10, dimethylmercury ((CH 3) 2 Hg) (abbr. DMM), a volatile colourless liquid, has been described as a 15. It is so dangerous that scientists have ...

  7. Heavy metals - Wikipedia

    en.wikipedia.org/wiki/Heavy_metals

    A different chemistry-based approach advocates replacing the term "heavy metal" with two groups of metals and a gray area. Class A metal ions prefer oxygen donors; class B ions prefer nitrogen or sulfur donors; and borderline or ambivalent ions show either class A or B characteristics, depending on the circumstances. [32]

  8. Chalcogen - Wikipedia

    en.wikipedia.org/wiki/Chalcogen

    Highly metal-rich metal chalcogenides, such as Lu 7 Te and Lu 8 Te have domains of the metal's crystal lattice containing chalcogen atoms. While these compounds do exist, analogous chemicals that contain lanthanum , praseodymium , gadolinium , holmium , terbium , or ytterbium have not been discovered, as of 2008.

  9. Group 3 element - Wikipedia

    en.wikipedia.org/wiki/Group_3_element

    Group 3 is the first group of transition metals in the periodic table.This group is closely related to the rare-earth elements.It contains the four elements scandium (Sc), yttrium (Y), lutetium (Lu), and lawrencium (Lr).