Determine the empirical formula of a sample that has 34.6% aluminum, 61.5% oxygen, and 3.85% hydrogen

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.

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Word equation for k(s) +h2o(l) yield koh (aq) + h2