What is electochemical series?? What are …

When the electrodes (metals and non-metals) in contact with their ions are arranged on the basis of the values of their standard reduction potentials or standard oxidation potentials, the resulting series is called the electrochemical or electromotive or activity series of the elements.
Characteristics of Electrochemical Series

• The substances which are stronger reducing agents than hydrogen are placed above hydrogen in the series and have negative values of standard reduction potentials.
• All those substances which have positive values of reduction potentials and placed below hydrogen in the series are weaker reducing agents than hydrogen.
• The substances which are stronger oxidising agents than H+ion are placed below hydrogen in the series.
• The metals on the top (having high negative values of standard reduction potentials) have the tendency to lose electrons readily. These are active metals.
• The activity of metals decreases from top to bottom.
• The non-metals on the bottom (having high positive values of standard reduction potentials)
• have the tendency to accept electrons readily. These are active non-metals.
• The activity of non-metals increases from top to bottom.