Answer to Question #53784 in Inorganic Chemistry for manisha

According to Bronsted-lowry theory acid is a compound that can transfer proton to any other compound.
As to reductants and reducing power, it is well known fact that alkaline metals from I period of the periodic table are the best reductunts. Reduction power and as a result reduction nature increase from the top of the period to the bottom, because atomic radius increases. With the increase of atomic radius electron affinity decreases. Metal with the highest atomic radius is the strongest reductunt.
For example in the line Li – Fr, Fr is the strongest reductant because it has the highest atomic radius.