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 ...

Small molecules - AQA A covalent bond is a shared pair of electrons. Covalent bonding forms molecules. Substances with small molecules have low melting and boiling points, and do not conduct ...

But an ionic bond is formed between two atoms when electrons are taken from one atom by the other, unlike a covalent bond where the atoms share their electrons. And, taken rhymes with shaken.