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  2. Electron configurations of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Electron_configurations_of...

    As an approximate rule, electron configurations are given by the Aufbau principle and the Madelung rule. However there are numerous exceptions; for example the lightest exception is chromium, which would be predicted to have the configuration 1s 2 2s 2 2p 6 3s 2 3p 6 3d 4 4s 2 , written as [Ar] 3d 4 4s 2 , but whose actual configuration given ...

  3. Periodic table (electron configurations) - Wikipedia

    en.wikipedia.org/wiki/Periodic_table_(electron...

    Configurations of elements 109 and above are not available. Predictions from reliable sources have been used for these elements. Grayed out electron numbers indicate subshells filled to their maximum. Bracketed noble gas symbols on the left represent inner configurations that are the same in each period. Written out, these are: He, 2, helium : 1s 2

  4. Ruthenium - Wikipedia

    en.wikipedia.org/wiki/Ruthenium

    Ruthenium dissolves in fused alkalis to give ruthenates (RuO 2− 4). It is not attacked by acids (even aqua regia) but is attacked by sodium hypochlorite at room temperature, and halogens at high temperatures. [11] Ruthenium is most readily attacked by oxidizing agents. [12] Small amounts of ruthenium can increase the hardness of platinum and ...

  5. Template:Periodic table (electron configuration) - Wikipedia

    en.wikipedia.org/wiki/Template:Periodic_table...

    Download as PDF; Printable version; ... move to sidebar hide. Electron configurations of the chemical elements (neutral gaseous atoms ... Ru 1 7 - 45 Rh 1 8 - 46 Pd ...

  6. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    In hydrogen, there is only one electron, which must go in the lowest-energy orbital 1s. This electron configuration is written 1s 1, where the superscript indicates the number of electrons in the subshell. Helium adds a second electron, which also goes into 1s, completely filling the first shell and giving the configuration 1s 2. [39] [58] [i]

  7. List of elements by atomic properties - Wikipedia

    en.wikipedia.org/wiki/List_of_elements_by_atomic...

    This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.

  8. Group 8 element - Wikipedia

    en.wikipedia.org/wiki/Group_8_element

    Group 8 is a group (column) of chemical elements in the periodic table.It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs). [1] " Group 8" is the modern standard designation for this group, adopted by the IUPAC in 1990. [1]

  9. Electron configuration - Wikipedia

    en.wikipedia.org/wiki/Electron_configuration

    In each term of an electron configuration, n is the positive integer that precedes each orbital letter (helium's electron configuration is 1s 2, therefore n = 1, and the orbital contains two electrons). An atom's nth electron shell can accommodate 2n 2 electrons. For example, the first shell can accommodate two electrons, the second shell eight ...