MCQ
Which is incorrect configuration for $s-$ block elements?
- A$\ce{[Ar]3d^{10}4s^2}$
- B$\ce{[Ar]3d^{10}4s^1}$
- ✓Both $A$ and $B$
- DNone of these
✓
Answer
Correct option: C.
Both $A$ and $B$
$\ce{[Ar]3d^{10}4s^2} - $ Last filling electron is in $3d.$
$\ce{[Ar]3d^{10}4s^1}-$ Last filling electron is in $3d.$
Thus, both are $d-$ block element.
$\ce{[Ar]4s^{1-2}}$ is a configuration of $s-$ block.
$\ce{[Ar]3d^{10}4s^1}-$ Last filling electron is in $3d.$
Thus, both are $d-$ block element.
$\ce{[Ar]4s^{1-2}}$ is a configuration of $s-$ block.
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