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What Best Describes The Bromide Ion That Forms




The bromide ion is a negatively charged ion that consists of a single bromine atom with an extra electron. It is denoted by the symbol Br^-. Bromide ions are commonly found in various compounds and have several important applications. In this article, we will provide an in-depth understanding of the bromide ion, including its structure, properties, and applications.

Structure Of Bromide Ion:

The bromide ion has a similar structure to other halide ions such as chloride and iodide. It consists of a single bromine atom with a negative charge, resulting from the gain of one electron. The atomic number of bromine is 35, which means it has 35 protons in the nucleus. In a neutral atom, the number of electrons is equal to the number of protons. However, when the bromine atom gains one electron, it becomes a negatively charged ion, known as the bromide ion.

Properties Of Bromide Ion:

The bromide ion has several important properties, including its physical and chemical properties.

Physical Properties:

The bromide ion has a relatively large ionic radius of 196 pm, which is due to the addition of an extra electron to the outermost shell of the bromine atom.

The melting and boiling points of bromide ions are relatively high compared to other halide ions. This is due to the stronger intermolecular forces between bromide ions.
The bromide ion is a colorless ion that does not absorb visible light. Therefore, it does not have any color.

Chemical Properties:

The bromide ion is a weak nucleophile and a weak base. This is due to its relatively large size, which makes it difficult to approach the positively charged center of other atoms or molecules.

Bromide ions can form various compounds with other elements or ions, such as silver bromide (AgBr) and potassium bromide (KBr).
Bromide ions can undergo various reactions such as substitution and oxidation-reduction reactions.

Applications Of Bromide Ion:

The bromide ion has several important applications in various fields, including:


Bromide ions are widely used in photography as a component of silver bromide (AgBr). When exposed to light, silver bromide is reduced to metallic silver, which forms the basis of photographic images.


Bromide ions have been used in medicine to treat various conditions such as epilepsy and other neurological disorders. Bromide ions have a sedative effect on the central nervous system, which helps to reduce seizures and other symptoms.


Bromide ions are used in agriculture to fumigate soil and control pests. Bromide ions are used in the form of methyl bromide, which is a potent pesticide that can kill a wide range of pests.

Water Treatment:

Bromide ions are used in water treatment to disinfect water. When mixed with chlorine, bromide ions can form hypobromous acid, which is a potent disinfectant that can kill harmful microorganisms in water.


In conclusion, the bromide ion is an important ion that has several important applications in various fields. Its properties, including its physical and chemical properties, make it a versatile ion that can form various compounds and undergo various reactions. The bromide ion's applications, including its use in photography, medicine, agriculture, and water treatment, highlight its importance in modern society. Therefore, it is essential to continue research on the bromide ion to explore new applications and improve existing ones.

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