Easy
The electronic configuration of $Cu$ is
- A$[Ne] 3s^{2}, 3p^{6}, 3d^{9}, 4s^{2}$
- B$[Ar] 3d^{10}, 4s^{1}$
- C$[Ne] 3s^{2}, 3p^{6}, 3d^{3}, 4s^{2}, 4p^{6}$
- D$[Ne] 3s^{2}, 3p^{6}, 3d^{5}, 4s^{2}, 4p^{4}$
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Total number of ions from the following with noble gas configuration is . . . . . . .
$Sr^{2+} (Z=38), Cs^{+} (Z=55), La^{2+} (Z=57), Pb^{2+} (Z=82), Yb^{2+} (Z=70) \text{ and } Fe^{2+} (Z=26)$
$Sr^{2+} (Z=38), Cs^{+} (Z=55), La^{2+} (Z=57), Pb^{2+} (Z=82), Yb^{2+} (Z=70) \text{ and } Fe^{2+} (Z=26)$
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