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Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is by mass the most common element on Earth, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust. Iron's very common presence in rocky planets like Earth is due to its abundant production as a result of fusion in high-mass stars, wherein the production of nickel-56 is the last nuclear fusion reaction that is exothermic. Therefore, radioactive nickel is the last element to be produced, before collapse of a supernova causes the explosion that abundantly scatters this precursor radionuclide into space.