The first ionisation energy of first atom is greater than that of second atom, whereas reverse order — Periodic Table and Periodicity Chemistry Question
Question
The first ionisation energy of first atom is greater than that of second atom, whereas reverse order is true for their second ionisation energy. Which set of elements is in accordance to above statement ?
Answer: A,B,C,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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