What phenomenon is called allotropy? What allotropic modifications of phosphorus exist?

What phenomenon is called allotropy? What allotropic modifications of phosphorus exist? Specify the type of crystal lattice for white phosphorus and red phosphorus.

The phenomenon when the same chemical element forms several simple substances is called allotropy.
Allotropic modifications of phosphorus; white, red and black phosphorus.
White phosphorus has a molecular crystal lattice, while red has an atomic one.

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