Halogens of the Periodic Table
The halogens are the group 17 elements: highly reactive nonmetals that form salt compounds with metals. There are 6 elements of this category in the periodic table, from Fluorine (F), atomic number 9, to Tennessine (Ts), atomic number 117.
Halogens at a glance
- Number of elements: 6
- Phase under standard conditions: Solid 3 elements; Gas 2 elements; Liquid 1 elements
Element list
| Atomic no. | Symbol | Name | Atomic mass | Phase | Short configuration |
|---|---|---|---|---|---|
| 9 | F | Fluorine | 18.998 | Gas | [He] 2s² 2p⁵ |
| 17 | Cl | Chlorine | 35.45 | Gas | [Ne] 3s² 3p⁵ |
| 35 | Br | Bromine | 79.904 | Liquid | [Ar] 3d¹⁰ 4s² 4p⁵ |
| 53 | I | Iodine | 126.9 | Solid | [Kr] 4d¹⁰ 5s² 5p⁵ |
| 85 | At | Astatine | 210 | Solid | [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵ |
| 117 | Ts | Tennessine | 294 | Solid (a theoretical prediction) | [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵ |
Frequently asked questions
Which elements are the halogens?
The halogens are Fluorine, Chlorine, Bromine, Iodine, Astatine and Tennessine.
How many elements are in the halogens category?
The periodic table has 6 elements in the halogens category.