The atomic number of an element is the number of

Hello!

The atomic number of an element is the number of protons, and also the total positive charge, in the atomic nucleus. You can learn more about this by looking into the Bohr model (a system consisting of a small, dense nucleus surrounded by revolving electrons —similar to the structure of the Solar System, but with attraction provided by electrostatic forces rather than gravity.) Hope this helps, and do you mind giving brainliest if you do find this helpful? :)

The atomic number of an element is the number of protons found in the nucleus of an atom.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

digestion

it excretes wastes