Electrons occupy specific orbits or shells, with each shell having a fixed electron capacity. As the atomic number increases, electron layers fill from the inside out.

Explain the concept of electron shells and their capacity.

• They can hold any number of electrons

• They have a fixed capacity

• They are filled based on energy levels

• They are irrelevant to atomic structure

What happens to the filling of electron shells as the atomic number increases?

• They are filled randomly

• They are filled from inside out

• They are filled from outside in

• They remain empty