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anion

Primary Information
Secondary Information

Definition

An anion is a negatively charged ion. It is formed when an atom gains one or more electrons. Anions are attracted to cations, which are positively charged ions.

Anions are found in many different substances, including salt, water, and acids. They are also important in the human body, where they play a role in many different bodily functions.

Here are some examples of anions:

  • Chloride (Cl-)
  • Fluoride (F-)
  • Sulfate (SO42-)
  • Nitrate (NO3-)
  • Hydroxide (OH-)

How can the word be used?

The anion exchange resin removed the chloride ions from the water.

anion

Different forms of the word

Noun: anion.

Adjective: anionic.

Plural: anions.

Synonyms: negatively charged ion, radical anion.

Antonyms: cation, positively charged ion.

Etymology

The word "anion" comes from the Greek word anión, which means "going up" or "ascending." The word anión is made up of the prefix an, which means "not," and the verb ion, which means "to go.".

Question

How is an anion formed?

AQA Science Exam Question and Answer

Question:

What is an anion?

Answer:

  • An anion is an ion with a negative charge. Anions are formed when an atom gains one or more electrons.