Someone please get this correct i got half of this correct

What will most likely happen when two bromine atoms bond together?

What metric units would you use to measure the thickness of a key

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope