Which one of the following is a different pair? — Periodic Table and Periodicity Chemistry Question
Question
Which one of the following is a different pair?
Answer: D
💡 Solution & Explanation
Step 1: Analyze the group classification of the elements in each pair in the periodic table. Step 2: Li and Na both belong to Group 1 (alkali metals). Be and Ba both belong to Group 2 (alkaline earth metals). N and As both belong to Group 15 (pnictogens). O belongs to Group 16 (chalcogens) while At belongs to Group 17 (halogens). Step 3: Conclude that O and At belong to different groups, making (d) the different pair.
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