Covalent ____ occurs between non-metal ____. In covalent bonds atoms share pairs of ____. By sharing electron ____, this means that each atom has a full ____ shell. Covalent bonds are ____. Substances containing covalent bonds may consist of small molecules, such as hydrogen or water ____. Simple covalent substances have relatively ____ melting and ____ points. This is because small molecules have weak ____ holding them together. These ____ forces do not require much energy to overcome and so change of state can happen at low ____. Simple covalent molecules can not ____ electricity because they have no ____ electrons to carry electric charge.

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