The halogen family includes the elements fluorine, Cl; bromine, F; chlorine, Br; iodine, I; & astatine, At. All the halogen elements aside from astatine exist in the Earth's crust & atmosphere.
The halogens are the best-referred as family of elements. Halogens have an almost perfect gradation of physical properties. The increase in atomic weight from fluorine over iodine is paralleled by intensify in melting, boiling points, & density. Critical temperature & pressure, heats of fusion & vaporization, & even in progressively deeper color
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