For other uses, see Iron (disambiguation). 26 manganese ← iron → cobalt - ↑ Fe ↓ Ru periodic table General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55.845(2) g/mol Electron configuration [Ar] 3d6 4s2 Electrons per shell 2, 8, 14, 2 Physical properties Phase solid Density (near r.t.) 7.86 g·cm−3 Liquid density at m.p. 6 ...
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