How do the metallic properties change in periods, why?

The metallic properties of chemical elements belonging to the same period decrease from left to right. Sodium, magnesium and aluminum belong to chemical elements of the 3rd period.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.