Multiple choice

Contains nonmetals, 7 valence electrons in its outermost energy level. Very reactive.

  1. Halogens

  2. Alkalines

  3. Nobel Gasses

  4. Transition Metals

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A Correct answer
Explanation

Halogens are located in Group 17 of the periodic table and possess 7 valence electrons, making them highly reactive as they seek to gain one electron to complete their outer shell.