20 Examples of Ionic Bonding

To form the molecules of the chemical compounds, the atoms of the different substances or elements must combine with each other in a stable way. This can occur in various ways by virtue of the structural characteristics that everything has atom (consisting of a positively charged nucleus surrounded by a cloud of electrons).

The electrons are negatively charged and remain close to the nucleus because the electromagnetic force of the protons attracts them. The closer an electron is to the nucleus, the greater the energy required to get it released.

But not all elements are the same: some have a tendency to lose the outermost electrons of the cloud (elements with low ionization energy), while others tend to capture them (elements with high affinity electronics). This happens because according to Lewis octet rule, stability is associated with the presence of 8 electrons in the u orbital shell (region of space where it is more likely to find an electron around the outermost atom), at least in most cases.

Due to this, to form the different chemical compounds, the neutral atoms give up, accept or share the electrons of their last shell. electronics, always trying to have 8 electrons left in it, although there are always exceptions, such as hydrogen, which can only have 2 electrons.

Ionic bonds

So, as the neutral atoms they can gain or lose electrons, they can form ions opposite charge. The electrostatic attraction between the oppositely charged ions causes the ions to bond together and form chemical compounds, in which one of the elements gave up electrons and the other received them. So that this can happen and a ionic bond It is necessary that there is a difference or delta of electronegativity between the elements involved of at least 1.7.

The ionic bond, generally, occurs between a metallic compound and a non-metallic one: the atom of the metal it gives up one or more electrons and, consequently, forms positively charged ions (cations), and the nonmetal gains them and becomes the negatively charged particle (anion). The alkali metals and the alkaline earths are the elements that have the most tendency to form cations, and halogens and oxygen are those that usually constitute the anions.

In general, the compounds that are formed by ionic bonds are crystalline solids to temperature environment, insoluble in water and high point of fusion, in case the attractions between its ions are strong. On the other hand, when the attraction between their ions is weaker, they have lower melting points and are soluble in water.

In solution they are very good electricity conductors since they are strong electrolytes, that is, they ionize easily forming anions and cations that can carry electrical charges. On the other hand, the lattice energy of an ionic solid is what marks the attractive force between the ions of that solid.

It is important to clarify that there is neither a completely ionic bond nor a completely ionic bond. covalent (produced between two atoms that share the electrons of their last level or shell of Energy). Actually, both types of links have a percentage of each. Some scientists regard the ionic bond as an exaggeration of the covalent bond.

Examples of ionic bonds