The halogen triad, according to the provided reference, includes bromine, iodine, and chlorine. These elements were grouped together based on similar chemical properties, representing an early attempt to classify elements.
The reference highlights a specific aspect of this triad:
- The mean value of the atomic masses of iodine and chlorine is stated as 81.1.
While the reference mentions a specific calculation related to atomic masses, the core concept is that bromine, iodine, and chlorine were once considered a triad due to shared characteristics within the halogen family.
