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Ionic compounds is a chemical compound composed of ions. The negative and the positive ions are attracted to each other, they hold on to or become together forming ionic compounds. The negative charge which gain an electron are known as anions. While cations a positive charge that lose electron are known as anions. Anions are known to be nonmetals, while cations are known to be metals. Ionic compounds are compared to covalent compounds. Covalent compounds are made of two or more nonmetals bonded by sharing valence electron. When an atom losses an atom, the other atom gives an electron to the other atoms so that they could be balanced. There are many examples of ionic compound, one is Potassium chloride. Potassium chloride is a salt formed by a k+ ion and a Cl-. Ionic compounds are important part of chemistry. 
When Cations a positively charged atom/molecule are attracted to Anion which are negatively charged atoms/molecules a Ionic compound is formed. Also when a metal and nonmetal are forming ions the resulting compound is called an ionic compound. Cations are formed when metal ion losses and valence electron, while anion is formed when a nonmetal gains a valence electron. Examples of an ionic compounds are NaCl which is a table salt which is shown on the image, and sodium are formed to create a silver white metal and chlorine a yellow green non metal. These are created by ionic bonding which will be talked about next. 
Ionic Bonding or ionic bonds form through electrovalence which means the loss or gain of an electron.The gain or loss of valence electron allows it to fulfill the octet rule. The octet rule states that the atom is best when the electron fill the outer most shell. Noble gasses such as Helium, Neon, Argon and Krypton have a full outer shell because helium has 2 electron which fills the first shell. The way that ionic compound and ionic bonds work, is that they try to make all of their charges neutral.
To find the formula for ionic compound we must balance out the charges of the ions. For example Magnesium has a 2+, because Magnesium has two valence electron that it would have to get rid of. Fluorine has seven valence electron which means it is Fl-, because it only needs to gain one electron to fulfill the octet rule, as shown in the periodic table Fluorine is only element away from a noble gas, that's why it is a Fl-. The two ions need to balance each other. so we need Fl- to have 2, because to negative Fl and two postive magnesium balance each other out. At the end the formula would be MgF2. 
Ionic compounds are contrasted to be close or packed up next to each other just like a crystalline. The structure is created through the lattice energy. The lattice energy is the amount of energy contained in the crystalline compound. The strength of the bond is determined by the charges of the ions. The bonds are strongest when the ions are small, becuase the valence electron is closest to the nucleus. The bonds are stronger when they are larger. For example the lattice energy for NaCl as shown in the image has an Na+ and Cl-. The lattice energy is large for the sodium and small fore the chlorine. The two combined is what created this structure. This structure has a giant ionic structure which means it contains a lot of atoms. The structure of the ionic compound has a lot of important. 
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