What is the correct electronic configuration of $Th$ $(Z=90)$?
- A$[Rn] \, 5f^0 \, 6d^2 \, 7s^2$
- B$[Rn] \, 5f^2 \, 6d^2 \, 7s^0$
- C$[Rn] \, 5f^2 \, 6d^0 \, 7s^2$
- D$[Rn] \, 5f^1 \, 6d^2 \, 7s^2$
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Similar Questions
All those elements belong to $f-$block whose atomic numbers are
Easy
View SolutionWhich of the following lanthanoids is radioactive?
Match the properties given in List-$I$ with the elements given in List-$II$:
List-$I$ (Property) List-$II$ (Element) $(A)$ Lanthanoid showing $+4$ oxidation state $(i)$ $Pm$ $(B)$ Lanthanoid showing $+2$ oxidation state $(ii)$ $Ce$ $(C)$ Radioactive lanthanoid $(iii)$ $Lu$ $(D)$ Lanthanoid with $4f^7$ configuration in $+3$ state $(iv)$ $Eu$ $(E)$ Lanthanoid with $4f^{14}$ configuration in $+3$ state $(v)$ $Gd$ - $(vi)$ $Dy$
| List-$I$ (Property) | List-$II$ (Element) |
| $(A)$ Lanthanoid showing $+4$ oxidation state | $(i)$ $Pm$ |
| $(B)$ Lanthanoid showing $+2$ oxidation state | $(ii)$ $Ce$ |
| $(C)$ Radioactive lanthanoid | $(iii)$ $Lu$ |
| $(D)$ Lanthanoid with $4f^7$ configuration in $+3$ state | $(iv)$ $Eu$ |
| $(E)$ Lanthanoid with $4f^{14}$ configuration in $+3$ state | $(v)$ $Gd$ |
| - | $(vi)$ $Dy$ |
Medium
View SolutionProvide the electronic configurations of lanthanoids $(4f)$ series elements $(Ln)$ and their ions $Ln^{2+}$ and $Ln^{3+}$,and state their characteristics.
Difficult
View SolutionWrite a note on oxidation states shown by lanthanoids.
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