The property possessed by certain elements to exist in two or more distinct forms that are chemically identical but have different physical properties. In the case of iron the crystal structure has one form at room temperature and another at high temperature. When heated above 910oC the atomic structure changes from body centered cubic to face centered cubic but reverts again when cooled. The allotropy of iron modifies the solubility of carbon, and it is because of this that steel can be hardened.
It has only 2 forms of allotropy not 4
Actually there are six isotopes of iron. Two of them are disintegrating ie radioactive
Fe -54, Fe-56, Fe-57 and Fe-58 are non radioactive where as Fe-55 and Fe-59 are radioactive in nature.
Fe-56 is the maximum which is available by 91.66%
Fe-54 by 5.82 percentage
Fe-57 by 2.19% and Fe-58 by 0.33 percentage.
Fe(ii) ferrous and Fe(iii) ferric are two forms of iron.
phosphorus
A Material that exists in two or more crystal stuctures. Also known as Allotropes. Many iron alloys are considered to be allotropic materials.
Allotropy is when an element has different forms. Some allotropes of carbon include graphite, diamond, and Buckminsterfullerenes, as well as others.https://en.wikipedia.org/wiki/Allotropes_of_carbon
The allotropic forms of carbon, Diamond, Graphite and others have only carbon-carbon bonds
The oxidation state (or number) is zero. This is true for any element in any of its allotropic elemental forms.
there are four allotrpic forms of iron...
Iron allotropes: alpha, gamma, delta and at high pressures epsilon .
Manganese can be ferromagnetic after a special treatment. Otherwise it is non reactive to magnetic fields in all four of its allotropic forms.
phosphorus
Phosphorus has six allotropes.
A Material that exists in two or more crystal stuctures. Also known as Allotropes. Many iron alloys are considered to be allotropic materials.
Antimony is an element that is metallic and can be found in four allotropic forms. It is used to make flame proof things like paint and battery plates.
Allotopes are forms of a chemical element different by structure.
CARBON
Sulfur
Applying a pressure on sodium chloride this remain solid; but the allotropic forms are changed.
Sulfur