WAEC - Chemistry (1989 - No. 13)
When an element can exist in two or more forms in the same physical state, the element is said to exhibit
isotopy
isomerism
allotropy
hygroscopy
sublimation
הֶסבֵּר
Allotropy refers to the existence of an element in two or more different forms in the same physical state, such as carbon existing as both graphite and diamond.