Here's how to figure out elements in the same period as chlorine:

* Understanding Periods: Periods in the periodic table are the horizontal rows. Elements in the same period have the same number of electron shells.

* Chlorine's Location: Chlorine (Cl) is in Period 3.

* Similar Period Elements: Any element in Period 3 would be in the same period as chlorine.

Examples of elements in the same period as chlorine:

* Sodium (Na)

* Magnesium (Mg)

* Aluminum (Al)

* Silicon (Si)

* Phosphorus (P)

* Sulfur (S)

* Argon (Ar)

Let me know if you'd like to explore any of these elements further!