What the symbol for an element that is a halogen?

Sep 8, 2016

Answer:

We usually use the $X$ symbol for substitution of halogen atoms.

Explanation:

For halogenation of olefins, we would thus write,

${H}_{2} C = C {H}_{2} + {X}_{2} \rightarrow X C {H}_{2} - C {H}_{2} X$

In general $X = C l , B r$. Iodine tends to be a little bit expensive. Fluorine chemistry is the preserve of specialists, because ${F}_{2}$ is extremely and dangerously reactive.