Find the molar volume of carbon dioxide gas if a 0.329 g CaCO3 sample reacted with excess HCl produces a volume of 78.51 mL of CO2.

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.