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Bromine and Iodine – Comparison – Properties

This article contains comparison of key thermal and atomic properties of bromine and iodine, two comparable chemical elements from the periodic table. It also contains basic descriptions and applications of both elements. Bromine vs Iodine.

bromine and iodine - comparison

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Bromine and Iodine – About Elements


Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine.


Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. It is even less abundant than the so-called rare earths. It is the heaviest essential mineral nutrient.

Bromine in Periodic Table

Iodine in Periodic Table

Source: www.luciteria.com

Bromine and Iodine – Applications


A wide variety of organobromine compounds are used in industry. Some are prepared from bromine and others are prepared from hydrogen bromide, which is obtained by burning hydrogen in bromine. Brominated flame retardants represent a commodity of growing importance, and make up the largest commercial use of bromine. One of the major uses of bromine is a water purifier/disinfectant, as an alternative to chlorine. Bromine compounds are effective pesticides, used both as soil fumigants in agriculture, particularly fruit-growing, and as a fumigant to prevent pests from attacking stored grain and other produce.


In addition to nutrition products, iodine and iodine derivatives are used in a wide range of medical, agricultural, and industrial applications. About half of all produced iodine goes into various organoiodine compounds, another 15% remains as the pure element, another 15% is used to form potassium iodide, and another 15% for other inorganic iodine compounds. The leading application is in the production of X-ray contrast media (22%). Iodine’s high atomic number and density make it ideally suited for this application, as its presence in the body can help to increase contrast between tissues, organs, and blood vessels with similar X-ray densities. It is used as an antiseptic for external wounds. Another application driving the demand for iodine is in polarizing film in liquidcrystal display (LCD) screens.

Bromine and Iodine – Comparison in Table

Element Bromine Iodine
Density 3.12 g/cm3 4.94 g/cm3
Ultimate Tensile Strength N/A N/A
Yield Strength N/A N/A
Young’s Modulus of Elasticity N/A N/A
Mohs Scale N/A N/A
Brinell Hardness N/A N/A
Vickers Hardness N/A N/A
Melting Point -7.3 °C 113.5 °C
Boiling Point 59 °C 184 °C
Thermal Conductivity 0.122 W/mK 0.449 W/mK
Thermal Expansion Coefficient N/A N/A
Specific Heat 0.473 J/g K 0.214 J/g K
Heat of Fusion 5.286 kJ/mol 7.824 kJ/mol
Heat of Vaporization 15.438 kJ/mol 20.752 kJ/mol