This means that this particular atom wants to gain one more electron to become stable. The ways to get the electron are through covalent bonding or ionic bonding. Covalent bonding would involve finding another atom that also needs one electron and mixing with it to form a stable compound. However, ionic bonding would mean that the atom would have to pull in an extra electron from a nearby atom that has one electrons too many (see figure 1). To understand this, an atoms electronegativity is also necessary to know. The electronegativity is the force of an atom that attracts other atoms. The atoms that want to gain electrons to become stable, generally have a higher electronegativity than other atoms, while the atoms that, for example only have 2 electrons in their outer shell, want to drop them to become stable, so their electronegativity is lower. Polar covalent bonds are covalent bonds where the sharing of the electron pair is unequal. This means that the electrons are spending more time around the non-metallic atom. In this kind of bond, the atoms have a charge separation, with one being partially positive and the other being partially negative. Hydrogen bond is only between hydrogen atoms and when they are joined in polar covalent bonds with a small atom of high