Question

which of the following would be elements that are found in the same period?
sn and rb
se and te
f and cl
k and ba

Explanation:

Step1: Recall the concept of periods in the periodic table

Elements in the same period have the same number of electron shells.

Step2: Check each pair

• Pair Sn (Tin) and Rb (Rubidium):

Sn is in period 5, Rb is in period 5.

• Pair Se (Selenium) and Te (Tellurium):

Se is in period 4, Te is in period 5.

• Pair F (Fluorine) and Cl (Chlorine):

F is in period 2, Cl is in period 3.

• Pair K (Potassium) and Ba (Barium):

K is in period 4, Ba is in period 6.

Answer:

Sn and Rb