Definition
Halogens: Any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group 17 on the periodic table.
In nature, you can find many elements in their element form, but not the halogens. Also, in the elements elemental form, fluorine is a highly toxic, colorless gas. It's actually the most reactive element. Chlorine is also a gas, but it is a pale green-yellow color. Bromine is a reddish-orange liquid with an unpleasant smell. Iodine is an intensely colored solid with an almost metallic luster.
Halogens: Any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group 17 on the periodic table.
In nature, you can find many elements in their element form, but not the halogens. Also, in the elements elemental form, fluorine is a highly toxic, colorless gas. It's actually the most reactive element. Chlorine is also a gas, but it is a pale green-yellow color. Bromine is a reddish-orange liquid with an unpleasant smell. Iodine is an intensely colored solid with an almost metallic luster.