Which elements in group 17 are diatomic?

The elements in group 17, also known as the halogens, that are diatomic under standard conditions are fluorine (F2), chlorine (Cl2), bromine (Br2), and iodine (I2). These elements naturally exist as diatomic molecules, meaning they form pairs of atoms. Astatine (At) is also a halogen but is less studied due to its radioactivity and rarity, and its diatomic nature is less certain.