
Iodine (I) is a chemical element of the periodic table, located in the group 17 and the period 5, and has the atomic number 53. It is a lustrous, black reactive nonmetal, whose name comes from the Greek word “iodes”, which means violet. It is counted as one of the heaviest elements in the halogen group.
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– p block |
FAQs on Iodine Element
Iodine |
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‣ What does iodine look like? Appearance: lustrous metallic grey solid, black/violet liquid, violet gas |
‣ When was iodine first discovered and by whom? Discovery and first isolation: Bernard Courtois (1811) |
‣ Where is iodine located on the periodic table?![]() Location: Iodine is found in the fifth row of the periodic table below the bromine element. |
‣ What is iodine atomic number? Atomic number (Z): 53 |
‣ What is the chemical symbol for iodine? Symbol: I |
‣ What is the atomic weight of iodine? Standard atomic weight: 126.90447 |
‣ What block is iodine in the periodic table? Block: p-block |
‣ What group is iodine in on the periodic table? Group: 17 (halogens) |
‣ Which period is iodine in on the periodic table? Period: 5 |
‣ What is the atomic radius of iodine? Atomic radius: empirical: 140 pm |
‣ Iodine covalent radius: 139±3 pm |
‣ Iodine Van der Waals radius: 198 pm |
‣ What is iodine melting point? Melting point: (I2) 386.85 K (113.7 °C, 236.66 °F) |
‣ What is the boiling point of iodine? Boiling point: (I2) 457.4 K (184.3 °C, 363.7 °F) |
‣ Iodine critical point: 819 K, 11.7 MPa |
‣ Iodine triple point: 386.65 K, 12.1 MPa |
‣ How many electron shells does iodine have? Electrons per shell: 2, 8, 18, 18, 7 |
‣ What is the condensed electron configuration of iodine? Electron configuration: [Kr] 4d10 5s2 5p5 |
‣ What is iodine ionization energy? Ionization energies: 1st: 1008.4 kJ/mol 2nd: 1845.9 kJ/mol 3rd: 3180 kJ/mol |
‣ What phase is iodine at room temperature? Phase (at r.t): solid |
‣ What is the density of iodine? Density (near r.t): 4.933 g/cm3 |
‣ Iodine magnetic ordering: diamagnetic |
‣ Iodine natural occurrence: primordial |
‣ What is the iodine oxidation state? Oxidation state: +5 |
‣ What is the electronegativity of iodine? Electronegativity: Pauling scale: 2.66 |
‣ Iodine heat of fusion: (I2) 15.52 kJ/mol |
‣ Iodine heat of vaporization: (I2) 41.57 kJ/mol |
‣ Iodine molar heat capacity: (I2) 54.44 J/(mol K) |
‣ Iodine molar magnetic susceptibility: -88.7 × 10-6 cm3/mol (298 K) |
‣ What type of structure does iodine have? Crystal structure: orthorhombic |
‣ Thermal conductivity of iodine: 0.449 W/(m.K) |
‣ Iodine electrical resistivity: 1.3 × 107 Ω.m (at 0 °C) |
‣ Bulk modulus of iodine: 7.7 GPa |
‣ Iodine CAS number: 7553-56-2 |
‣ Iodine vapor pressure
Vapor pressure (rhombic) | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 260 | 282 | 309 | 342 | 381 | 457 |
‣ How many isotopes does iodine have?
Main isotopes of iodine | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
123I | syn | 13 h | ε, γ | 123Te |
124I | syn | 4.176 d | ε | 124Te |
125I | syn | 59.40 d | ε | 125Te |
127I | 100 % | stable | ||
129I | trace | 1.57 × 107 y | β– | 129Xe |
131I | syn | 8.02070 d | β–, γ | 131Xe |
135I | syn | 6.57 h | β– | 135Xe |
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