Iron (Fe). Diagram of the nuclear composition and electron configuration of an atom of iron-56 (atomic number: 26), the most common isotope of this el
Iron (Fe). Diagram of the nuclear composition and electron configuration of an atom of iron-56 (atomic number: 26), the most common isotope of this element. The nucleus consists of 26 protons (red) and 30 neutrons (blue). 26 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). Iron is a transition metal in group 8, period 4, and the d-block of the periodic table. It has a melting point of 1538 degrees Celsius. The trends across the transition metals are due to electrons filling an inner d-subshell (here, within the 3rd ring), shielding the outer electrons from the increasing nuclear charge.
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