Where did I go wrong

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Find the mass, in grams, of 5.00*10^23 molecules of f2

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.