hydrogen vs chlorine vs iodine vs bromine

hydrogen (chemical element) | chlorine (chemical element) | iodine (chemical element) | bromine (chemical element)

Periodic table location

Images

| atomic symbol | atomic number | short electronic configuration hydrogen | H | 1 | 1s^1 chlorine | Cl | 17 | [Ne]3s^23p^5 iodine | I | 53 | [Kr]5s^24d^105p^5 bromine | Br | 35 | [Ar]4s^23d^104p^5 | Aufbau diagram | block | group hydrogen | 1s | s | 1 chlorine | 3p 3s | p | 17 iodine | 5p 4d 5s | p | 17 bromine | 4p 3d 4s | p | 17 | period | atomic mass | half-life hydrogen | 1 | 1.008 u | (stable) chlorine | 3 | 35.45 u | (stable) iodine | 5 | 126.90447 u | (stable) bromine | 4 | 79.904 u | (stable)

phase at STP | all | gas | liquid | solid melting point | median | -54.4 °C | highest | 113.7 °C (iodine) | lowest | -259.14 °C (hydrogen) | distribution | boiling point | median | 12 °C | highest | 184.3 °C (iodine) | lowest | -252.87 °C (hydrogen) | distribution | critical temperature | median | 502 K | highest | 819 K (iodine) | lowest | 32.97 K (hydrogen) | distribution | critical pressure | median | 9.166 MPa | highest | 11.7 MPa (iodine) | lowest | 1.293 MPa (hydrogen) | distribution | molar heat of fusion | median | 4.5 kJ/mol | highest | 7.76 kJ/mol (iodine) | lowest | 0.558 kJ/mol (hydrogen) | distribution | molar heat of vaporization | median | 12.5 kJ/mol | highest | 20.9 kJ/mol (iodine) | lowest | 0.452 kJ/mol (hydrogen) | distribution | specific heat at STP | median | 712.7 J/(kg K) | highest | 14300 J/(kg K) (hydrogen) | lowest | 429 J/(kg K) (iodine) (properties at standard conditions)

density | median | 1.562 g/cm^3 | highest | 4.94 g/cm^3 (iodine) | lowest | 8.99×10^-5 g/cm^3 (hydrogen) | distribution | molar volume | median | 5530 cm^3/mol | highest | 11200 cm^3/mol (hydrogen) | lowest | 25.61 cm^3/mol (bromine) bulk modulus | median | 1.9 GPa | highest | 7.7 GPa (iodine) | lowest | 1.1 GPa (chlorine) refractive index | median | 1.000773 | highest | 1.001132 (bromine) | lowest | 1.000132 (hydrogen) thermal conductivity | median | 0.15 W/(m K) | highest | 0.449 W/(m K) (iodine) | lowest | 0.0089 W/(m K) (chlorine) | distribution | (properties at standard conditions)

resistivity | median | 1×10^7 Ω m (ohm meters) | highest | 1×10^10 Ω m (ohm meters) (bromine) | lowest | 100 Ω m (ohm meters) (chlorine) electrical conductivity | median | 1×10^-7 S/m (siemens per meter) | highest | 0.01 S/m (siemens per meter) (chlorine) | lowest | 1×10^-10 S/m (siemens per meter) (bromine) volume magnetic susceptibility | median | -7.66×10^-6 | highest | -2.23×10^-9 (hydrogen) | lowest | -2.22×10^-5 (iodine) | distribution | mass magnetic susceptibility | median | -6.05×10^-9 m^3/kg (cubic meters per kilogram) | highest | -4.5×10^-9 m^3/kg (cubic meters per kilogram) (iodine) | lowest | -2.48×10^-8 m^3/kg (cubic meters per kilogram) (hydrogen) | distribution | molar magnetic susceptibility | median | -6.47×10^-10 m^3/mol (cubic meters per mole) | highest | -4.999×10^-11 m^3/mol (cubic meters per mole) (hydrogen) | lowest | -1.14×10^-9 m^3/mol (cubic meters per mole) (iodine) | distribution |

valence | median | 5 | highest | 7 (iodine) | lowest | 1 (hydrogen) | distribution | electronegativity | median | 2.81 | highest | 3.16 (chlorine) | lowest | 2.2 (hydrogen) | distribution | electron affinity | median | 309.9 kJ/mol (kilojoules per mole) | highest | 349 kJ/mol (kilojoules per mole) (chlorine) | lowest | 72.8 kJ/mol (kilojoules per mole) (hydrogen) | distribution | first ionization energy | median | 1195.6 kJ/mol (kilojoules per mole) | highest | 1312 kJ/mol (kilojoules per mole) (hydrogen) | lowest | 1008.4 kJ/mol (kilojoules per mole) (iodine) | distribution |

term symbol | all | ^2P_(3/2) | ^2S_(1/2) atomic radius | median | 108 pm | highest | 140 pm (iodine) | lowest | 25 pm (hydrogen) covalent radius | median | 111 pm | highest | 139 pm (iodine) | lowest | 31 pm (hydrogen) | distribution | van der Waals radius | median | 180 pm | highest | 198 pm (iodine) | lowest | 120 pm (hydrogen) (electronic ground state properties)

universe abundance | median | 5.03×10^-5 mass% | highest | 75 mass% (hydrogen) | lowest | 1×10^-7 mass% (iodine) meteorite abundance | median | 0.019 mass% | highest | 2.4 mass% (hydrogen) | lowest | 2.5×10^-5 mass% (iodine) crust abundance | median | 0.0086 mass% | highest | 0.15 mass% (hydrogen) | lowest | 4.9×10^-5 mass% (iodine) ocean abundance | median | 1 mass% | highest | 11 mass% (hydrogen) | lowest | 6×10^-6 mass% (iodine) human abundance | median | 0.06 mass% | highest | 10 mass% (hydrogen) | lowest | 2×10^-5 mass% (iodine) universe molar abundance | median | 2×10^-6 mol% | highest | 93 mol% (hydrogen) | lowest | 1×10^-9 mol% (iodine) meteorite molar abundance | median | 0.008 mol% | highest | 17 mol% (hydrogen) | lowest | 3×10^-6 mol% (iodine) ocean molar abundance | median | 0.18 mol% | highest | 66 mol% (hydrogen) | lowest | 2.9×10^-7 mol% (iodine) crust molar abundance | median | 0.005 mol% | highest | 3.1 mol% (hydrogen) | lowest | 8×10^-6 mol% (iodine) human molar abundance | median | 0.011 mol% | highest | 62 mol% (hydrogen) | lowest | 1×10^-6 mol% (iodine)