Why does calcium have a larger atomic radius than magnesium

Down the group , atomic radius of atoms increase due to increase in number of shells there by increasing shielding effect and decreasing effective nuclear charge . ( effective nuclear charge pulls the valence shell closer to the nucleus)

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a