Respuesta :
The correct answer is C. An atom having only one valence electron is highly chemically reactive. The valence electron says a lot to the reactivity of an atom. For example, sodium has only one valence electron which makes it so reactive and unstable. The alkali metals have only 1 valence electron.
Answer:The correct answer is C. Highly
Explanation:
its correct because I got it correct on my test sooo..yuup.!
-hope this helps.!!