Answer:
atoms
Explanation:
all things in the universe are made of atoms and they are considered the fundamental unit of matter.
non-living things are composed of different compounds and molecules.
living things are made of cells, and cells themselves are made of different molecules. So living things are also made of atoms.
People starting to eat healthy
Answer:
2nd level has 4 orbitals. An f sublevel has 7 orbitals.
