Oxidation state 3
From Halbeeg, the open encyclopedia · Af-Soomaali
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Oxidation state 3 is the third oxidation state that a chemical element can have when separated according to how its atoms are bonded together and how electrons behave. Many elements have several different forms (allotropes) or several physical states (phases). When arranged in a list, one is called "oxidation state 1", the next "oxidation state 2", and the third "oxidation state 3".
The term "state" here typically refers to a categorical distinction made in documentation or data collection, not a universal physical marker. For this reason its meaning depends on the classification system being used.
Phases and allotropes
An allotrope is a distinct form of the same element, differing in how its atoms are bonded together. A well-known example is carbon: diamond, graphite, and other forms. These forms of the same element have very different physical properties, such as hardness and electrical conductivity.
A phase (or state of matter) refers to the physical condition of a substance: solid, liquid, gas, or plasma. Some elements have multiple solid phases that transform into each other under different temperatures and pressures. The categorization "state 1, 2, 3" sometimes refers to these phases of the solid state.
Use in open data systems
Open data projects such as Wikidata use structured identifiers to distinguish between different states of elements. The identifier Q25683265 represents the concept of "oxidation state 3" in that system. These identifiers are designed to be machine-readable, and on their own do not carry meaning without reference to the system from which they come.