Select all the words that describe what the elements have in common if they are located on the same PERIOD. Orbitals
Rounds
Shells
Dots
Energy Levels
Circles

Orbitals

Shells

Energy Levels

Explanation:

Elements in the same period will have the same energy levels which is the same as orbitals and shells.

The period of an element indicates the energy level in an atom. Elements in period 1 will have one energy level or shell or orbitals. Down a group this is not the case. The energy level increases from top to bottom. As we go down the group, we are transiting from one period to another.

The mass has escaped into a gas which you can not see so the law stays true.