Question

the most reactive group of metals is group and the most reactive group of nonmetals is group

Explanation:

Step1: Recall metal reactivity in groups

Alkali metals (Group 1) are the most reactive metals. They have 1 valence electron, easily lost.

Step2: Recall nonmetal reactivity in groups

Halogens (Group 17) are the most reactive nonmetals. They have 7 valence electrons, easily gain 1 electron.

Answer:

The most reactive group of metals is group \(\boldsymbol{1}\) and the most reactive group of nonmetals is group \(\boldsymbol{17}\) (or group 7A in some numbering systems).