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  2. Phosphorus - Wikipedia

    en.wikipedia.org/wiki/Phosphorus

    Phosphorus is a chemical element; it has symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus , but because it is highly reactive , phosphorus is never found as a free element on Earth.

  3. Chemical symbol - Wikipedia

    en.wikipedia.org/wiki/Chemical_symbol

    The periodic table, ... Many functional groups also have their own chemical symbol, e.g. Ph for the phenyl group, ... where balls for carbon are black and for oxygen red.

  4. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    Dmitri Mendeleev, Russian chemist who proposed the periodic table: f-block groups 7 f-block [258] (10.3) (1100) – – 1.3 – synthetic unknown phase 102 No Nobelium: Alfred Nobel, Swedish chemist and engineer f-block groups 7 f-block [259] (9.9) (1100) – – 1.3 – synthetic unknown phase 103 Lr Lawrencium: Ernest Lawrence, American ...

  5. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    The pH range is commonly given as zero to 14, but a pH value can be less than 0 for very concentrated strong acids or greater than 14 for very concentrated strong bases. [2] The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. [3]

  6. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3 ; it is usually shown at the foot of the table to save horizontal space.

  7. Vanadium - Wikipedia

    en.wikipedia.org/wiki/Vanadium

    The interrelationships in this family are described by the predominance diagram, which shows at least 11 species, depending on pH and concentration. [29] The tetrahedral orthovanadate ion, VO 3− 4, is the principal species present at pH 12–14. Similar in size and charge to phosphorus(V), vanadium(V) also parallels its chemistry and ...

  8. Iodine - Wikipedia

    en.wikipedia.org/wiki/Iodine

    This is an accepted version of this page This is the latest accepted revision, reviewed on 31 December 2024. This article is about the chemical element. For other uses, see Iodine (disambiguation). Chemical element with atomic number 53 (I) Iodine, 53 I Iodine Pronunciation / ˈ aɪ ə d aɪ n, - d ɪ n, - d iː n / (EYE -ə-dyne, -⁠din, -⁠deen) Appearance lustrous metallic gray solid ...

  9. Arsenic - Wikipedia

    en.wikipedia.org/wiki/Arsenic

    The main factors are pH and the redox potential. Generally, the main forms of arsenic under oxic conditions are H 3 AsO 4, H 2 AsO − 4, HAsO 2− 4, and AsO 3− 4 at pH 2, 2–7, 7–11 and 11, respectively. Under reducing conditions, H 3 AsO 4 is predominant at pH 2–9. Oxidation and reduction affects the migration of arsenic in subsurface ...

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