Mole ratio of aluminum to hydrogen gas - 2Al + 2H3PO4 —> 3 H2 + 2AlPO4

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

answerlinnaeus;