Si belong to the carbon family. Graphite is an important allotrope of carbon. But Si does not form an analogous of graphite. What are the possible reasons that you can suggest?

Diamond and Graphite are carbon's……………. ( allotropic forms, isotopic forms)

Why does elemental silicon not form a graphite - like structure, whereas carbon does?

Iron is a metal which corrodes fast. What are the factors that favour the corrosion of iron? In coastal regions, copper nails are preferred to iron nails. What could be the reason? Can you suggest some measures to prevent the corrosion of iron?

Why does not silicon form an analogue of graphite? OR Why does elemental silicon not form graphite like structure as carbon does? Explain.