The halogens are five non-metallic elements with similar properties, found in group 17 of the periodic table.
The halogens are fluorine, chlorine, bromine, iodine, and astatine. Because they are missing an electron from their outermost shell, they react readily with most metals to form salts.
The halogens or halogen elements are a group in the periodic table consisting of five chemically related elements, fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
The artificially created element 117 (ununseptium) may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17.
| Name | Symbol | Atomic Number | Atomic Weight |
|---|---|---|---|
| Fluorine | F | 9 | 18.9984032 |
| Chlorine | Cl | 17 | 35.4527 |
| Bromine | Br | 35 | 79.904 |
| Iodine | I | 53 | 126.90447 |
| Astatine | At | 85 | -209.9871 |
Astatine is a radioactive chemical element with an atomic number 85 in the periodic table of elements. The total amount of astatine found naturally in the Earth’s crust is almost 25 grams at any given time, which makes astatine the rarest chemical element on Earth. Being a member of the family of halogen elements in … Read more
Iodine (I) is a chemical element with atomic number 53 in the periodic table. It’s a relatively rare element that’s naturally found in Earth’s crust. Accounting for 460 parts per billion in the layers of our planet, iodine is preceded by 60 other chemicals in relation to the natural abundance of elements. Classified as a … Read more
Bromine is a nonmetallic chemical element with an atomic number of 35 in the periodic table of elements. Its pure elemental form is rarely found in Earth’s crust. Being a member of the halogen elements family of the periodic table with seven valence electrons, bromine is highly reactive and easily makes numerous compounds with the … Read more
Chlorine is a chemical element with an atomic number of 17 in the periodic table of elements. It’s the twentieth most abundant element found in Earth’s crust, amounting to 130 ppm or 0.01 percent. Being a member of the halogen family of periodic table elements, chlorine is a highly reactive chemical substance with seven valence … Read more
Fluorine (F) is a chemical element with an atomic number of 9 in the periodic table of elements. It’s the 13th most abundant element found in Earth’s crust with a concentration of 950 ppm in the upper layers. This univalent poisonous gaseous halogen element of the periodic table forms a vast number of compounds with … Read more