Question

10 which two elements on the periodic table are in the same period ? a se and te b k and ba c sn and rb d f and cl

Explanation:

Step1: Recall period concept

Periods are horizontal rows on periodic table.

Step2: Check each option

• Option A: Se (selenium) is in period 4, Te (tellurium) is in period 5.
• Option B: K (potassium) is in period 4, Ba (barium) is in period 6.
• Option C: Sn (tin) and Rb (rubidium) are both in period 5.
• Option D: F (fluorine) is in period 2, Cl (chlorine) is in period 3.

Answer:

C. Sn and Rb