How many neutrons does the isotope of hydrogen called deuterium have

The deuterium has one neutron and one proton (mass number equals 2) whereas, the far more common hydrogen isotope, protium, has no neutons in the middle.

Explanation

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.