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Iodine vs. Iodide: What's the Difference?

Edited by Huma Saeed || By Sawaira Riaz || Published on January 18, 2024
Iodine is a chemical element (symbol I) with a dark, lustrous appearance and strong disinfectant properties. Iodide is a negative ion of iodine (I-) typically formed when iodine bonds with another element.

Key Differences

Iodine is a non-metallic element, found naturally in some foods and used in various medical and industrial applications. Iodide, on the other hand, is the ionized form of iodine, usually occurring when iodine gains an electron during a chemical reaction.
Huma Saeed
Jan 18, 2024
In its elemental form, iodine is known for its dark purple crystals and a distinctive odor, used as a disinfectant and in thyroid hormone production. Iodide, being the ion form, is usually combined with other elements, like potassium, to form compounds like potassium iodide.
Sawaira Riaz
Jan 18, 2024
Iodine can be used in water purification and as a dietary supplement to prevent iodine deficiency. Iodide, in its compound form, is often used in medical treatments, such as in thyroid therapies and as a protective agent against radiation.
Sawaira Riaz
Jan 18, 2024
Iodine's antibacterial properties make it effective for wound cleaning and water treatment. Iodide ions, being more stable, are commonly used in salt and food additives to ensure iodine intake.
Sawaira Riaz
Jan 18, 2024
Iodine in its elemental form is less stable and can be hazardous in high concentrations. Iodide, being more stable and less reactive, is often preferred in dietary and medical applications.
Aimie Carlson
Jan 18, 2024
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Comparison Chart

Chemical Form

Elemental form (I)
Ionized form (I-)
Sawaira Riaz
Jan 18, 2024

Appearance and Properties

Dark purple crystals, volatile, strong odor
Typically found in compound forms, more stable
Huma Saeed
Jan 18, 2024

Uses in Medicine

Disinfectant, thyroid hormone production
Thyroid treatments, radiation protection
Sawaira Riaz
Jan 18, 2024

Stability and Reactivity

Less stable, more reactive
More stable, less reactive
Sawaira Riaz
Jan 18, 2024

Common Forms and Applications

Pure iodine, water purification
Potassium iodide, dietary supplements
Harlon Moss
Jan 18, 2024
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Iodine and Iodide Definitions

Iodine

It's a vital component of thyroid hormones.
Dietary iodine is essential for thyroid health.
Sawaira Riaz
Dec 22, 2023

Iodide

Iodide can protect against radiation exposure.
Potassium iodide tablets are distributed in nuclear emergencies.
Aimie Carlson
Dec 22, 2023

Iodine

It's found naturally in certain foods and seawater.
Seaweed is a rich natural source of iodine.
Sawaira Riaz
Dec 22, 2023

Iodide

Iodide is the ionized form of iodine, often found in compounds.
Potassium iodide is used as a dietary supplement.
Sawaira Riaz
Dec 22, 2023

Iodine

Iodine can be used for water purification.
Iodine tablets are used to disinfect water in emergency situations.
Aimie Carlson
Dec 22, 2023

Iodide

It's used in medical treatments, like thyroid therapy.
Iodide is given to patients with thyroid gland dysfunction.
Huma Saeed
Dec 22, 2023

Iodine

Iodine is a dark purple non-metallic element used in disinfection.
Iodine is applied to wounds for its antiseptic properties.
Sawaira Riaz
Dec 22, 2023

Iodide

It's commonly added to table salt to prevent iodine deficiency.
Iodized salt is a primary source of iodide in many diets.
Sawaira Riaz
Dec 22, 2023

Iodine

Iodine is less stable in its elemental form.
Elemental iodine is handled carefully in laboratories due to its reactivity.
Harlon Moss
Dec 22, 2023

Iodide

Iodide ions are more stable than elemental iodine.
Iodide is preferred in food additives for its stability.
Sawaira Riaz
Dec 22, 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.
Sawaira Riaz
Dec 20, 2023

Iodide

Univalent anionic iodine, or a compound of iodine, especially a binary compound of iodine with a more electropositive element.
Sawaira Riaz
Dec 20, 2023

Iodide

(inorganic chemistry) A binary compound of iodine and another element or radical.
Sawaira Riaz
Dec 20, 2023

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.
Sawaira Riaz
Dec 20, 2023

Iodide

A salt or ester of hydriodic acid
Sawaira Riaz
Dec 20, 2023

FAQs

What is iodine?

A non-metallic element, important for thyroid function and used as a disinfectant.
Sawaira Riaz
Jan 18, 2024

How is iodine used in medicine?

As a disinfectant and for thyroid hormone production.
Sawaira Riaz
Jan 18, 2024

Is iodide present in table salt?

Yes, as potassium iodide to prevent iodine deficiency.
Aimie Carlson
Jan 18, 2024

Is iodine naturally occurring?

Yes, in seawater, certain soils, and foods.
Aimie Carlson
Jan 18, 2024

What is iodide?

The ionized form of iodine, often found in compounds like potassium iodide.
Huma Saeed
Jan 18, 2024

What are the medical uses of iodide?

In thyroid therapy and as a protective agent against radiation.
Janet White
Jan 18, 2024

Can iodine be found in food?

Yes, especially in seafood and iodized salt.
Sawaira Riaz
Jan 18, 2024

Can iodine be harmful?

In high concentrations, it can be toxic.
Harlon Moss
Jan 18, 2024

Can iodine deficiency affect health?

Yes, leading to thyroid disorders and cognitive impairments.
Janet White
Jan 18, 2024

What form does iodide typically take?

It's usually part of compounds, like potassium iodide.
Sawaira Riaz
Jan 18, 2024

Why is iodide added to salt?

To ensure sufficient dietary intake of iodine.
Sawaira Riaz
Jan 18, 2024

How is iodide beneficial for thyroid health?

It's a key component of thyroid hormones.
Aimie Carlson
Jan 18, 2024

Is iodine used in emergency kits?

Yes, for water purification and as a protective agent against radiation.
Harlon Moss
Jan 18, 2024

What is the role of iodide in radiation protection?

It helps protect the thyroid from radioactive iodine.
Sawaira Riaz
Jan 18, 2024

How is iodine used in water treatment?

To purify water through its antibacterial properties.
Sawaira Riaz
Jan 18, 2024

Are iodine and iodide safe for everyone?

Generally, but excessive intake or allergies may cause issues.
Sawaira Riaz
Jan 18, 2024

How are iodine and iodide different in chemical reactivity?

Iodine is more reactive, while iodide is less reactive and more stable.
Sawaira Riaz
Jan 18, 2024

What is the difference in stability between iodine and iodide?

Iodide is more stable than elemental iodine.
Janet White
Jan 18, 2024

Why is iodine important for health?

It's crucial for the production of thyroid hormones.
Harlon Moss
Jan 18, 2024

Are there dietary supplements for iodine?

Yes, often in the form of iodide.
Aimie Carlson
Jan 18, 2024
About Author
Written by
Sawaira Riaz
Sawaira is a dedicated content editor at difference.wiki, where she meticulously refines articles to ensure clarity and accuracy. With a keen eye for detail, she upholds the site's commitment to delivering insightful and precise content.
Edited by
Huma Saeed
Huma is a renowned researcher acclaimed for her innovative work in Difference Wiki. Her dedication has led to key breakthroughs, establishing her prominence in academia. Her contributions continually inspire and guide her field.

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