Give a reason why covalent compounds exist as gases, liquids or soft solids?

Bonding in which —

1. CCl₄
2. H₂
3. HCl
4. NH₄Cl

— involves coordinate bonding.

Explain the bonding in methane molecule using electron dot structure.

An element L consists of molecules.

(i) What type of bonding is present in the particles that make up L?

(ii) When L is heated with iron metal, it forms a compound FeL. What chemical term would you use to describe the change undergone by L?