| Crystalline forms of carbon | Non-crystalline forms of carbon |
| (i) A crystalline form has a regular and definite arrangement of atoms. | (i) A non-crystalline form does not have a regular and definite arrangement of atoms. |
| (ii) They have high melting points and boiling points. | (ii) They have low melting points and boiling points. |
| (iii) A crystalline form has a definite geometrical shape, sharp edges and plane surfaces. | (iii) They are amorphous, hence, they do not have definite geometrical shape. |
| (iv) Diamond, graphite and fullerene are different crystalline forms of carbon. | (iv) Coal, charcoal and coke are different non‐ crystalline/amorphous forms of carbon. |
