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Anion

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Intro to Chemistry

Definition

An anion is a negatively charged ion formed when an atom gains one or more electrons. Anions are typically larger than their parent atoms due to the added electrons.

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5 Must Know Facts For Your Next Test

  1. Anions are formed by the gain of electrons.
  2. Anions are attracted to the anode (positive electrode) in electrolysis.
  3. Common examples of anions include Cl⁻, O²⁻, and SO₄²⁻.
  4. Nonmetals tend to form anions because they have higher electronegativity.
  5. The ionic radius of an anion is larger than its atomic radius.

Review Questions

  • What happens to the size of an atom when it becomes an anion?
  • Name two common elements that form anions.
  • Why do nonmetals often form anions?
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