Question

What is the name of $LiI$?

Answer 1

Hint: Compounds are named according to the norms set by IUPAC. A compound that has ions is an ionic compound. An ionic compound has the name of the cation that is the positive ion is written first, and then the name of the anion, the negative ion is written after the cation. Lithium is a metal and iodide is a non – metal.

Complete answer:
A chemical compound is named on the basis of the elements present in that compound. Ionic compounds are the compounds that are formed when transfer of electrons occur. These compounds are formed between a metal and a non – metal. For the naming of ionic compounds, the cation, which is the positive charge containing ion, is named first, and then the anion, which is the negative charge containing ion, is named after the cation.
We have been given $LiI$ which has lithium and iodine. As we know lithium is an element of the alkali metals from group 1, so it is a metal that converts to a cation, while iodine is the non – metal halogen, that takes 1 electron to convert into iodide anion.
So, the name will be in the manner that lithium will come first and then iodine in the form of iodide, as lithium iodide.
Hence, the name of the compound $LiI$ is lithium iodide.

Note:
In lithium iodide, the more electronegative is the iodide ion, as it has more tendency to attract electrons towards itself. The name of the negative ion in any ionic compound changes and has ‘ide’ in the end. So, chlorine becomes chloride, bromine becomes bromide, and iodine becomes iodide.