Question

the region around the nucleus that takes of the most volume of the atom. atomic number. mass number. compound. electron cloud

Explanation:

In an atom, the nucleus is very small in volume compared to the overall atom. The electrons move in the region around the nucleus called the electron - cloud, which takes up most of the volume of the atom. The atomic number is related to the number of protons in the nucleus, the mass number is the sum of protons and neutrons in the nucleus, and a compound is made up of two or more different types of atoms chemically bonded together.

Answer:

Electron Cloud