There are only seven diatomic elements that default to this double bond. Five of them — hydrogen, nitrogen, fluorine, oxygen and chlorine — are gases at room temperature and normal pressure.

Hydrogen atoms are close together. The electron from each atom feels the attraction from the proton in the nucleus of the other atom. This attraction pulls the atoms together and the electrons are ...

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 ...

The properties of elements and compounds can be explained ... boiling points are different due to the ethanol containing hydrogen bonding. Ether is a symmetrical molecule, so even though it ...