Intro to Chemistry
| Front | What balances the positive charge of the nucleus? |
| Back | Electrons. |
| Front | Why do energy levels become mixed with others further into the electron configuration? |
| Back | As the number of electrons increases, so does the repulsion between them, so the orbitals that house those electrons become mixed. |
| Front | What is the aufbau order? |
| Back | When electrons fill an atom’s orbitals, they always fill the lowest-energy orbital available first. |