Definition

1. Noun:
   • A serial arrangement of metallic elements or ions according to their electrode potentials: The electrochemical series is a list of metals (and sometimes hydrogen) ordered by their standard electrode potentials. This order indicates the relative tendency of a metal to lose electrons (oxidize) or gain electrons (reduce) under standard conditions.
   • A predictive tool for redox reactions: The series shows the tendency of one metal to reduce the ions of any other metal placed below it in the list. Conversely, a metal can oxidize the ions of any metal above it.

Usage Examples

• Noun:
  • In the electrochemical series, sodium is placed above iron, indicating sodium is more easily oxidized.
  • By consulting the electrochemical series, we can predict that zinc will displace copper from a solution of copper sulfate.
  • The position of an element in the electrochemical series determines its reactivity in galvanic cells.

Advanced Usage

• "To be high/low in the electrochemical series": Describes an element's relative tendency to oxidize. A metal high in the series (like lithium or potassium) has a strong tendency to lose electrons and form positive ions. A metal low in the series (like gold or platinum) has a weak tendency to lose electrons.

  • Magnesium is high in the electrochemical series, making it a good sacrificial anode for corrosion protection.

• "The driving force of a reaction can be deduced from the electrochemical series": The further apart two metals are in the series, the greater the potential difference and the stronger the driving force for a redox reaction between them.

  • The large voltage of a lithium-ion battery is due to lithium's position at the very top of the electrochemical series relative to the cathode material.

Variants and Related Words

• Electromotive series (EMF series): Another name for the electrochemical series.
• Standard electrode potential (E°): The measured voltage that defines an element's position in the series.
• Redox potential: A more general term for the tendency of a chemical species to acquire electrons and be reduced.

Synonyms

• Electromotive force series (EMF series): A fully synonymous term.
• Activity series: A closely related list focusing on the displacement reactivity of metals in aqueous solutions, often derived from the electrochemical series.

Related Phrases and Concepts

• Galvanic series: A similar series but specific to metals and alloys in a particular environment (like seawater), used primarily in corrosion science. It is different from the standard electrochemical series.
• Standard reduction potential table: A more comprehensive table that includes non-metals and ions, showing standard potentials for reduction half-reactions. The electrochemical series for metals is a subset of this table.

Noun

1. a serial arrangement of metallic elements or ions according to their electrode potentials determined under specified conditions; the order shows the tendency of one metal to reduce the ions of any other metal below it in the series