Group 1 (for metals) and group 17 (for non metals).
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This is the group 1, the alkali metals.
These chemical elements are located in the group 17.
The most reactive nonmetal is fluorine. Fluorine is a halogen, which is Group 17 on the Periodic Table, and the halogens are the most reactive...
Beryllium is the least reactive in the group 2.
group 1 and group 17 are the most reactive groups