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

Ithink it’s c or b for the answer.

Answer is c just took the test on edgenuity

Earth's escape velocity is 11.2 km/splanes only fly up to 0.3 km/s at most.planes won't even be able to get out ofearth's gravitational pull.nonetheless survive the vacuum.