JAMB - Chemistry (2000 - No. 31)
A phenomenon where an element exist in different forms in the same physical state is known as
isomerism
amorphism
allotropy
isotopy
Explanation
Allotropy is the existence of two or more different physical forms of an element. For instance, Carbon exhibit allotropy as it exists in about three different forms, physically such as Diamond, Graphite and amorphous Carbon.