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)

Question

Total number of ions from the following with noble gas configuration is ____ . Sr 2+ (Z = 38), Cs + (Z = 55), La 2+ (Z = 57), Pb 2+ (Z = 82), Yb 2+ (Z = 70) and Fe 2+ (Z = 26)

TestHub · Accepted Answer

Noble gas configuration = ns 2 np 6 ​ [ Sr 2 + ] = [ Kr ] [ Cs + ] = [ Xe ] [ Yb 2 + ] = [ Xe ] 4 f 14 [ La 2 + ] = [ Xe ] 5 d 1 [ Pb 2 + ] = [ Xe ] 4 f 14 5 d 10 6 s 2 [ Fe 2 + ] = [ Ar ] 3 d 6 ​

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