If you like us, please share us on social media or tell your professor. Consider building or adopting a Wikitext for your course like Prof. Dianne Bennett from Sacramento City College demonstrates in this video.

ChemWiki: The Dynamic Chemistry Hypertext > Under Construction > Demonstrations > Additional Demos > The Relative Activity of Metals

The Relative Activity of Metals

Chemical Concepts Demonstrated

  • Relative activity of metals
  • Metal classification based on reactivity


  • Drop samples of sodium, magnesium, aluminum, and iron metal into water.
  • Drop samples of magnesium, aluminum, and iron metal into 6M HCl.





sodium Highly reactive in water.

Highly reactive in acid.

magnesium No reaction in water at room temperature.

Reacts rapidly in acid.

aluminum No reaction in water at room temperature.

No reaction.

iron No reaction in water.

No reaction.


Notice the metals' locations in the periodic table. The most reactive metals have the greatest tendency to lose electrons to form positively charged ions. Metals, therefore, become more reactive as they are located further to the left on the periodic table. Based on the activities of the metals, the four metals can be separated into three different categories:

  1. Reactive in both acid and water (i.e. high reactivity): sodium (and, by extension, other alkali metals)
  2. Reactive in acid, but not water (i.e. moderate reactivity): magnesium (and, by extension, other alkaline-earth metals)
  3. Unreactive in both acid and water (i.e. low reactivity): aluminum and iron (and, by extension, other transition and Group IIIA metals)



You must to post a comment.
Last modified
16:05, 18 Feb 2014



(not set)
(not set)
(not set)






This material is based upon work supported by the National Science Foundation under Grant Numbers 1246120, 1525057, and 1413739.

Creative Commons License Unless otherwise noted, content in the UC Davis ChemWiki is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. Permissions beyond the scope of this license may be available at copyright@ucdavis.edu. Questions and concerns can be directed toward Prof. Delmar Larsen (dlarsen@ucdavis.edu), Founder and Director. Terms of Use