Reference Point
On a Frost diagram the element is generally set as the reference point at 0 volts.
The lower a point is on the Frost diagram the more stable it is. This indicates the most stable oxidation state for that element. Points found high in the upper-left (when the x-axis is arranged so that high positive oxidation states are closer to the origin and "high" negative oxidation states are found further along the positive x-axis) indicate an element that will act as a strong oxidizing agent at that oxidation state.
Read more about this topic: Frost Diagram
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—Henry David Thoreau (1817–1862)