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  2. Iron - Wikipedia

    en.wikipedia.org/wiki/Iron

    Iron is a chemical element; it has the symbol Fe (from Latin ferrum 'iron') and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table . It is, by mass, the most common element on Earth , forming much of Earth's outer and inner core .

  3. Isotopes of iron - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_iron

    Iron-60 is an iron isotope with a half-life of 2.6 million years, [12] [13] but was thought until 2009 to have a half-life of 1.5 million years. It undergoes beta decay to cobalt-60 , which then decays with a half-life of about 5 years to stable nickel-60.

  4. Chemical element - Wikipedia

    en.wikipedia.org/wiki/Chemical_element

    Iron 26 Fe 55.845: Cobalt 27 Co ... in atomic number. Elements higher in atomic number than iron, including heavy elements like uranium and plutonium, ...

  5. Effective nuclear charge - Wikipedia

    en.wikipedia.org/wiki/Effective_nuclear_charge

    The 1s electron of iron (the closest one to the nucleus) sees an effective atomic number (number of protons) of 25. The reason why it is not 26 is that some of the electrons in the atom end up repelling the others, giving a net lower electrostatic interaction with the nucleus.

  6. Iron–nickel alloy - Wikipedia

    en.wikipedia.org/wiki/Iron–nickel_alloy

    The affinity of nickel atoms (atomic number 28) for iron (atomic number 26) results in natural occurring alloys and a large number of commercial alloys.The surfaces of these metallic compounds provide a complex electron environment for catalyzing chemical reactions.

  7. List of elements by stability of isotopes - Wikipedia

    en.wikipedia.org/wiki/List_of_elements_by...

    Since a nucleus with an odd number of protons is relatively less stable, odd-numbered elements tend to have fewer stable isotopes. Of the 26 "monoisotopic" elements that have only a single stable isotope, all but one have an odd atomic number—the single exception being beryllium. In addition, no odd-numbered element has more than two stable ...

  8. 26 (number) - Wikipedia

    en.wikipedia.org/wiki/26_(number)

    26 is the smallest even number n such that both n + 1 and n − 1 are composite. With an aliquot sum of 16 , within an aliquot sequence of five composite numbers (26, 16 , 15 , 9 , 4 , 3 , 1 ,0) to the Prime in the 3 -aliquot tree.

  9. 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.