Each atom then has a complete outer shell of electrons. The slideshow shows how a covalent bond forms between a hydrogen atom and a chlorine atom, making hydrogen chloride. A simple molecule ...

Try these interactive flashcards based on GCSE chemistry past papers. By working your way through the flashcards created by experts, you can prepare for your chemistry exams and make your revision ...

Save guides, add subjects and pick up where you left off with your BBC account ... substances with many covalent bonds, graphene and fullerenes. If you struggled with the quiz, don't panic ...

Carbon atoms can form four covalent bonds. This is why they can form many different organic substances, such as diamond, graphite and fullerenes.

Save guides, add subjects and pick up where you left off with your BBC account ... variable is the volume of the reactants. Covalent bonding involves the sharing of electrons between atoms.