Covalent Bonding

How non-metal elements combine by covalent bonds to form compounds. Chemistry - Atoms And Bonding - Learning Points. Covalent bonds occur between non-metal atoms. The number of bonds depends on how many electrons are in the outer shell. Chlorine is only short of one electron so can only form one covalent bond. Oxygen is short of two electrons. It can bond with two hydrogen atoms to become water. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.