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.

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.