In the laboratory, an unknown element x reacts with fluorine. the following ionic compound is obtained: xf.
according to the valence electrons of fluorine, to which family does the element x belong?
select one:
a. halogen
b. alkali metals
c. noble gases
d. alkaline earth metals

alkali metals

Explanation:

Fluorine is highly reactive and has an almost full outer shell, therefore, it wants to quickly gain an electron to fill its putter shell. The best materials to reach with are ones that have one electron in their outer shell.

the answer for sodium is 0.186

the answer for rubidium is 0.251