ionic

MIT Biology Hypertextbook: Chemistry Review

1.3 Ionic Bonds

Ionic bonds are formed when there is a complete transfer of electrons from one atom to another, resulting in two ions, one positively charged and the other negatively charged. For example, when a sodium atom (Na) donates the one electron in its outer valence shell to a chlorine (Cl) atom, which needs one electron to fill its outer valence shell, NaCl (table salt) results. The symbol for sodium chloride is Na+Cl-. Ionic bonds are often 4-7 kcal/mol in strength.

Membrane Proteins

molecular attractions ( ionic , hydrogen , and/or Van der Waals bonds).