Fluorine has an atomic number of 9. The n = 1 energy level has two electrons, and the n = 2 energy level has seven electrons. Flourine's valence is _____. +2 -2 +1 -1

Fluorine has an atomic number of 9. The n = 1 energy level has two electrons, and the n = 2 energy level has seven electrons. Flourine's valence is _____.

+2
-2
+1
-1