pentavalent

/pen'tævələnt/

Thân thiện

A chemist draws a pentavalent atom in a molecular diagram.

Definition

1. Adjective:
   • Having a valence of five: In chemistry, this describes an atom, ion, or element that has a combining power of five. This means it can form bonds with five other atoms or groups.

Usage Examples

• Adjective:
  • Phosphorus is a pentavalent element in many of its compounds.
  • The pentavalent form of arsenic is less toxic than its trivalent counterpart.
  • A pentavalent vaccine protects against five different diseases.

Advanced Usage

• In Chemistry: The term is used to specify the oxidation state or bonding capacity of an element in a compound.
  • Nitrogen can exhibit a pentavalent state in compounds like nitric acid (HNO₃).
• In Immunology: Used to describe vaccines that are combined to immunize against five different pathogens.
  • The DTaP–IPV–Hib vaccine is a common pentavalent immunization for children.

Variants and Related Words

• Valence / Valency (n): The combining power of an element.
  • The valence of oxygen is typically two.
• Trivalent (adj): Having a valence of three.
• Tetravalent (adj): Having a valence of four.
• Hexavalent (adj): Having a valence of six.
• Pentavalence (n): The state of being pentavalent.

Synonyms

• Quinquivalent: A less common synonym with the same meaning (having a valence of five).

Notes on Meaning

The primary and almost exclusive meaning of "pentavalent" is in the context of chemistry and immunology, relating to the number five in bonding capacity or vaccine components. It is a technical term not typically used in everyday conversation.

Học thuật

Adjective

1. having a valence of five