Iron, 26 Fe Iron Ìhànsójú lustrous metallic with a grayish tinge Ìwúwo átọ̀mù A r, std (Fe) 55.845(2) Iron ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 26 Ẹgbẹ́ group 8 Àyè àyè 4 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Transition metalÌtò ẹ̀lẹ́ktrọ́nù [Ar ] 3d6 4s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 14, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 1811 K (1538 °C, 2800 °F) Ígbà ìhó 3134 K (2862 °C, 5182 °F) Kíki (near r.t. ) 7.874 g/cm3 when liquid (at m.p. ) 6.98 g/cm3 Heat of fusion 13.81 kJ/mol Heat of 340 kJ/mol Molar heat capacity 25.10 J/(mol·K) pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1728 1890 2091 2346 2679 3132
Atomic properties Oxidation states −4, −2, −1, 0, +1, +2 , +3 , +4, +5, +6 , +7 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 1.83 energies Atomic radius empirical: 126 pm Covalent radius 132±3 (low spin), 152±6 (high spin) pm Color lines in a spectral range Spectral lines of iron Other properties Natural occurrence primordial Crystal structure (bcc) Speed of sound thin rod (electrolytic) 5120 m/s (at r.t. ) Thermal expansion 11.8 µm/(m·K) (at 25 °C) Thermal conductivity 80.4 W/(m·K) Electrical resistivity 96.1 n Ω·m (at 20 °C) Magnetic ordering ferromagnetic Young's modulus 211 GPa Shear modulus 82 GPa Bulk modulus 170 GPa Poisson ratio 0.29 Mohs hardness 4 Vickers hardness 608 MPa Brinell hardness 490 MPa CAS Number 7439-89-6 Main isotopes of iron Isotope Abundance Half-life (t 1/2 ) Decay mode Product 54 Fe 5.8% >3.1×1022 y 2ε capture ? 54 Cr 55 Fe syn 2.73 y ε capture 0.231 55 Mn 56 Fe 91.72% 56 Fe is stable with 30 neutrons 57 Fe 2.2% 57 Fe is stable with 31 neutrons 58 Fe 0.28% 58 Fe is stable with 32 neutrons 59 Fe syn 44.503 d β− 1.565 59 Co 60 Fe syn 2.6×106 y β− 3.978 60 Co
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