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Iodide vs. Iodine: Know the Difference

Shumaila Saeed
By Shumaila Saeed || Updated on December 25, 2023
Iodide is a negatively charged ion of Iodine, a chemical element essential for thyroid function, with Iodine being the pure elemental form.
Iodide vs. Iodine

Key Differences

Iodide is a form of Iodine where the element carries a negative charge, making it an ion. This ionized form allows Iodide to be more soluble and bioavailable, particularly in biological systems. In contrast, Iodine is the elemental form, a non-metallic solid under standard conditions. It is less reactive than its ionized counterpart but is essential for synthesizing thyroid hormones.
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Shumaila Saeed
Dec 15, 2023
Iodide is typically found in saltwater, soil, and certain foods, where it is required for nutrition, especially for thyroid health. This ion is also used in medical imaging and as a nutritional supplement. Iodine, in its elemental form, has a dark purple-black color and a pungent odor. It is used in a range of applications, including disinfectants, pharmaceuticals, and photographic chemicals.
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In terms of reactivity, Iodide ions are more reactive than elemental Iodine. This reactivity is crucial in biological processes, such as hormone production in the thyroid gland. Elemental Iodine, while less reactive, can be dangerous in its pure form and is usually handled with care in laboratory and industrial settings.
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Dec 15, 2023
Iodide's role in the human body is predominantly in the form of thyroid hormones, where it is incorporated into the hormones T3 and T4. In contrast, elemental Iodine is rarely found in the human body; it is usually ingested in a different form and then converted to iodide for biological use.
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The chemistry of Iodide is characterized by its tendency to form salts with metals, such as potassium iodide. Elemental Iodine, however, is known for forming diatomic molecules (I2), which are used in various chemical reactions and processes.
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Shumaila Saeed
Dec 15, 2023
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Iodide and Iodine Definitions

Iodide

Iodine is a chemical element, essential for human health.
Iodine is necessary for proper metabolic function.
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Dec 04, 2023

Iodine

Iodine is converted to iodide in the human body.
When ingested, iodine is quickly transformed into iodide for biological use.
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Dec 04, 2023

Iodide

Iodine appears as a dark purple-black solid at room temperature.
Crystalline iodine can be seen in its solid form in chemistry labs.
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Dec 04, 2023

Iodine

Iodine appears as a dark purple-black solid at room temperature.
Crystalline iodine can be seen in its solid form in chemistry labs.
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Dec 04, 2023

Iodide

Iodine is used as a disinfectant and antiseptic.
Iodine solutions are applied to wounds to prevent infection.
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Dec 04, 2023
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Iodine

Iodine is used as a disinfectant and antiseptic.
Iodine solutions are applied to wounds to prevent infection.
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Shumaila Saeed
Dec 04, 2023

Iodide

Iodine is converted to iodide in the human body.
When ingested, iodine is quickly transformed into iodide for biological use.
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Dec 04, 2023

Iodine

Iodine can be dangerous in its elemental form.
Handling elemental iodine requires safety precautions due to its toxicity.
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Dec 04, 2023

Iodide

Iodine can be dangerous in its elemental form.
Handling elemental iodine requires safety precautions due to its toxicity.
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Dec 04, 2023

Iodine

Symbol I A lustrous, purple-black, corrosive, poisonous halogen occurring as a diatomic molecule, I2, that easily sublimes to give a purple gas and is a trace element essential for proper thyroid function. Radioactive isotopes, especially I-131, are used as medical tracers and in thyroid disease diagnosis and therapy. Iodine compounds are used as germicides, antiseptics, and dyes. Atomic number 53; atomic weight 126.9045; melting point 113.7°C; boiling point 184.4°C; density of gas 11.27 grams per liter; specific gravity (solid, at 20°C) 4.93; valence 1, 3, 5, 7. See Periodic Table.
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Iodide

Univalent anionic iodine, or a compound of iodine, especially a binary compound of iodine with a more electropositive element.
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Iodine

An antiseptic preparation containing iodine in solution, used to treat wounds.
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Iodide

(inorganic chemistry) A binary compound of iodine and another element or radical.
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Iodine

A chemical element (symbol: I) with an atomic number of 53; one of the halogens.
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Iodide

A binary compound of iodine, or one which may be regarded as binary, in which iodine has a valence of -1; as, potassium iodide.
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Iodine

An antiseptic incorporating the element.
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Iodide

A salt or ester of hydriodic acid
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Iodine

An iodide.
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Iodine

(transitive) to treat with iodine.
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Dec 01, 2023

Iodine

A nonmetallic element, of the halogen group of atomic number 53, occurring always in combination, as in the iodides. When isolated it is in the form of dark gray metallic scales, resembling plumbago, soft but brittle, and emitting a chlorinelike odor. Symbol I. Atomic weight 126.90. If heated, iodine volatilizes in beautiful violet vapors.
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Iodine

A nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)
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Iodine

A tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic
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Iodine

Iodine is a chemical element, essential for human health.
Iodine is necessary for proper metabolic function.
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Dec 04, 2023

Repeatedly Asked Queries

Can iodine be found in food?

Yes, iodine is present in foods, but often in the form of iodide.
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Dec 15, 2023

What is the main difference between iodide and iodine?

Iodide is the ionized form of iodine, which is the elemental form.
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Dec 15, 2023

How does the body use iodine?

The body converts iodine to iodide, which is then used to make thyroid hormones.
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Dec 15, 2023

Why is iodide important for health?

Iodide is crucial for thyroid hormone production and overall metabolic function.
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Is iodine safe to ingest in its elemental form?

Ingesting elemental iodine is not recommended; it's usually consumed in the form of iodide.
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Dec 15, 2023

Is iodine used in medical procedures?

Yes, iodine is used as a disinfectant and in contrast media for imaging.
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Dec 15, 2023

What happens if you don't get enough iodide?

Iodide deficiency can lead to thyroid disorders like goiter and hypothyroidism.
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Can you get iodide from non-food sources?

Yes, iodide can be taken as a dietary supplement.
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Dec 15, 2023

What are common sources of iodide?

Iodized salt, seafood, and dairy products are common sources of iodide.
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Can iodine be used in photography?

Yes, iodine is used in certain photographic chemicals.
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What form of iodine is used in table salt?

Table salt usually contains iodine in the form of iodide.
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Dec 15, 2023

How is iodide used in the thyroid gland?

The thyroid gland uses iodide to produce thyroid hormones.
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Dec 15, 2023

What is the role of iodine in the environment?

Iodine is naturally present in the environment, especially in the ocean.
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Is iodine reactive?

Elemental iodine is less reactive than iodide but can be hazardous.
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Can iodine deficiency affect children?

Yes, iodine deficiency in children can impact cognitive development.
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Dec 15, 2023

Are there risks to taking too much iodide?

Excessive iodide intake can lead to thyroid dysfunction.
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Dec 15, 2023

How do iodide and iodine interact chemically?

Iodine becomes iodide when it gains an electron.
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Dec 15, 2023

Is iodide or iodine more soluble in water?

Iodide is more soluble in water compared to elemental iodine.
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Dec 15, 2023

How does iodine help in wound care?

Iodine acts as an antiseptic, killing bacteria and preventing infection.
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Dec 15, 2023

What is the recommended dietary intake of iodine?

The recommended intake varies by age and health condition, typically around 150 micrograms daily for adults.
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Dec 15, 2023

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Shumaila Saeed
Written by
Shumaila Saeed
Shumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.

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