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  2. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    The periodic table, ... Nio­bium 41 Nb ... [60] and the various configurations are so close in energy to each other [50] ...

  3. Niobium - Wikipedia

    en.wikipedia.org/wiki/Niobium

    Niobium is a lustrous, grey, ductile, paramagnetic metal in group 5 of the periodic table (see table), with an electron configuration in the outermost shells atypical for group 5. Similarly atypical configurations occur in the neighborhood of ruthenium (44) and rhodium (45).

  4. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    The definitive visualisation of all 118 elements is the periodic table of the elements, ... 41 500: primordial solid 21 Sc ... 60: primordial solid 30 Zn

  5. 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.

  6. Technetium - Wikipedia

    en.wikipedia.org/wiki/Technetium

    Technetium is located in the group 7 of the periodic table, between rhenium and manganese. As predicted by the periodic law , its chemical properties are between those two elements. Of the two, technetium more closely resembles rhenium, particularly in its chemical inertness and tendency to form covalent bonds . [ 33 ]

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

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

    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 in the table below is [Ar] 3d 5 4s 1.

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  9. Neodymium - Wikipedia

    en.wikipedia.org/wiki/Neodymium

    Naturally occurring neodymium (60 Nd) is composed of five stable isotopes— 142 Nd, 143 Nd, 145 Nd, 146 Nd and 148 Nd, with 142 Nd being the most abundant (27.2% of the natural abundance)—and two radioisotopes with extremely long half-lives, 144 Nd (alpha decay with a half-life (t 1/2) of 2.29 × 10 15 years) and 150 Nd (double beta decay, t ...

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