JEE Main 2024 Chemistry question
Total number of ions from the following with noble gas configuration is . Sr²⁺ (z = 38), Cs⁺ (z = 55), La²⁺ (z = 57), Pb²⁺ (z = 82), Yb²⁺ (z = 70) and Fe²⁺ (z = 26)
Answer: 3
Solution
The source key counts Sr²⁺ ([Kr]), Cs⁺ ([Xe]) and Yb²⁺ ([Xe]4f¹⁴, taken as a filled,
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