Total number of ions from the following with noble gas configuration is_____
$Sr^{2 +} (Z = 38), Cs^{+} (Z = 55), La^{2 +} (Z = 57) Pb^{2 +} (Z = 82), Yb^{2 +} (Z = 70) and Fe^{2 +} (Z = 26)$

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 )

Accepted Answer

Correct answer: 3. (3) Noble gas configuration =ns^2np^6 ( Sr^2+ )= [ Kr ] ( Cs^+ )= [ Xe ] ( Yb^2+ )= [ Kr ]4 d^104f^145 s^25p^6 ( La^2+ )= [ Xe ]5 d^1 ( Pb^2+ )= [ Xe ]4f^145 d^106 s^2 ( Fe^2+ )= [ Ar ]3 d^6

$Total number of ions from the following with noble gas configuration is_____Sr^{2 +} (Z = 38), Cs^{+} (Z = 55), La^{2 +} (Z = 57) Pb^{2 +} (Z = 82), Yb^{2 +} (Z = 70) and Fe^{2 +} (Z = 26)$

Solution

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