Question

How‌ ‌halides‌ ‌are‌ ‌formed?

Answer 1

First try to understand what halides are. Then figure out how that component is related to the other elements in the periodic table, what type of compounds they form with other elements in the periodic table. Then take a specific example and try to understand how the compound is forming.

Complete step-by-step answer: Halides are binary compounds of which one part is halogen atom and the other part is an element or radical that is less electronegative or more electropositive than the halogen atom which form bromide, fluoride and chloride, etc. The alkali metals combine directly with halogens under appropriate conditions forming halides of the general formula $MX\,\left( {X = F,Cl,Br,I} \right)$. Most of the salts are halides. All Group $1$ metals form halides that are white solids at room temperature. Various halide compounds are tested using silver nitrate solution of which some include $KI,\,KBr,\,KCl$ .When halogen reacts with silver nitrate solution, precipitation will be formed, and it varies in colour depending upon the type of halides. While silver fluoride will form no precipitate, silver bromide forms pale yellow precipitate, silver iodide will form green precipitate and silver chloride will give a white precipitate.
Halogen Atom comprising a negative charge is termed as the halide ion. The halide anions are fluoride$\left( {{F^ - }} \right)$, chloride$\left( {C{l^ - }} \right)$, bromide $\left( {B{r^ - }} \right)$, iodide$\left( {{I^ - }} \right)$ and astatide $\left( {A{t^ - }} \right)$. Such ions are present in all ionic halide salts. Halide mineral includes halide anion. Fluorite and Halite are two important halide minerals. Fluorite is the main source of hydrogen fluoride. Halite is a primary source of Sodium Chloride. Bischofite forms a primary source of magnesium. Many of the halides are present in the marine evaporite deposits
All these halides are colourless, high melting crystalline solids having high negative enthalpies of formation.
Some examples of halide compounds include calcium chloride, silver chloride, potassium iodide, potassium chloride, sodium chloride, Iodoform, etc.
Metal Halides are compounds between a halogen and metals. Some are covalently bonded which may form polymeric structure, and some are ionic in nature. Metal Halides are formed when all halogens react with metal.
$2M\, + \,n{X_2}\, \to \,2M{X_n}$, where $M$ is the metal and $X$ is the halide.

Note: For these kinds of questions you must know the periodic table and the placement of the different elements in the periodic table very well. If you do not know what halogens are you will not be able to understand what halides are and how they are formed.