Which scientist discovered the existence of a center to the atom?

Ernest Rutherford

Explanation:

Atomic nuclei were discovered in 1911 by scientist Ernest Rutherford. He was also responsible for an important observation: the center (nucleus) of atoms contains protons. The neutron was identified years later by other scientists.

The nucleus is definitely very small compared to the size of the atom. To get an idea of its tiny size, let's compare the atom as if it were a football stadium, so the nucleus would be about the size of a pea.

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.