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(A) noble gas configuration corresponds to a filled valence shell,typically represented as $ns^2 np^6$ (or the configuration of $He, Ne, Ar, Kr, Xe, R

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$2$

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(A) noble gas configuration corresponds to a filled valence shell,typically represented as $ns^2 np^6$ (or the configuration of $He, Ne, Ar, Kr, Xe, Rn$).$1. Sr^{2+} (Z=38)$: Electronic configuration is $[Kr] 5s^0$,which is the noble gas configuration of $Kr$.$2. Cs^{+} (Z=55)$: Electronic configuration is $[Xe] 6s^0$,which is the noble gas configuration of $Xe$.$3. La^{2+} (Z=57)$: Electronic configuration is $[Xe] 5d^1$,which is not a noble gas configuration.$4. Pb^{2+} (Z=82)$: Electronic configuration is $[Xe] 4f^{14} 5d^{10} 6s^2$,which is not a noble gas configuration.$5. Yb^{2+} (Z=70)$: Electronic configuration is $[Xe] 4f^{14}$,which is not a noble gas configuration.$6. Fe^{2+} (Z=26)$: Electronic configuration is $[Ar] 3d^6$,which is not a noble gas configuration.Thus,only $Sr^{2+}$ and $Cs^{+}$ have noble gas configurations. The total number of such ions is $2$.

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

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