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

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

    This page shows the electron configurations of the neutral gaseous atoms in their ground states. For each atom the subshells are given first in concise form, then with all subshells written out, followed by the number of electrons per shell. For phosphorus (element 15) as an example, the concise form is [Ne] 3s 2 3p 3.

  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. Radium - Wikipedia

    en.wikipedia.org/wiki/Radium

    Radium is a chemical element; it has symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table , also known as the alkaline earth metals . Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a black surface layer of radium nitride (Ra 3 N 2 ).

  5. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    The following table shows the electron configuration of a neutral gas-phase atom of each element. Different configurations can be favoured in different chemical environments. [52] The main-group elements have entirely regular electron configurations; the transition and inner transition elements show twenty irregularities due to the ...

  6. Electron configuration - Wikipedia

    en.wikipedia.org/wiki/Electron_configuration

    The electron-shell configuration of elements beyond hassium has not yet been empirically verified, but they are expected to follow Madelung's rule without exceptions until element 120. Element 121 should have the anomalous configuration 8s 2 5g 0 6f 0 7d 0 8p 1, having a p rather than a g electron.

  7. Template : Infobox element/symbol-to-electron-configuration ...

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

    Element Group Electron configuration electron configuration (P8000) Term symbol note 1, 2, S, P, 1 H hydrogen: 1 1s 1: 1s¹ : 2 S 1/2: S: 2 He helium: 18 1s 2: 1s² : 1 S 0: S: 3 Li lithium

  8. Lewis structure - Wikipedia

    en.wikipedia.org/wiki/Lewis_structure

    [1] [2] [3] Introduced by Gilbert N. Lewis in his 1916 article The Atom and the Molecule, a Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds. [4] Lewis structures extend the concept of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.

  9. Chemical symbol - Wikipedia

    en.wikipedia.org/wiki/Chemical_symbol

    (The symbol is now sometimes used for an alkyl group.) [nb 1] Rd: Radium: 88: Current symbol is Ra. [nb 1] Rf: Rutherfordium: 106: Proposed name for seaborgium. The symbol and name were instead used for element 104. [nb 1] [nb 3] [5] Ro: Rhodium: 45: Current symbol is Rh. [nb 1] Sa: Samarium: 62: Current symbol is Sm. [nb 1] [5] So: Sodium: 11 ...