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Which halogen is most abundant in Earth’s crust?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — halogen Modern version of the periodic table of the elements.

Fluorine is the most abundant halogen in Earth’s crust. It makes up approximately 0.06 percent of the crust's igneous rocks, while chlorine accounts for about 0.031 percent.1