Here's why:

* Acids contain hydrogen ions (H+) that can be donated.

* Bases contain hydroxide ions (OH-) that can accept hydrogen ions.

When an acid and a base react, the hydrogen ions from the acid combine with the hydroxide ions from the base to form water (H2O). The remaining ions from the acid and base then combine to form a salt.

For example, the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH) produces sodium chloride (NaCl) and water:

HCl (acid) + NaOH (base) → NaCl (salt) + H2O (water)

So, while not a specific "group" of elements, salts are formed by the interaction of acids and bases, which ultimately involve elements from various groups on the periodic table.