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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Which of the following exhibits only $+ 3$ oxidation state ?
  • A
    $U$
  • B
    $Th$
  • ✓
    $Ac$
  • D
    $Pa$
✓

Answer

Correct option: C.
$Ac$
c
Actinium : Atomic No $= 89$

Configuration $=[\mathrm{Rn}] 6 \mathrm{d}^{17} \mathrm{s}^{2}$

stable oxidation state $\Rightarrow+3$

$\mathrm{Th}=+3,\,+4$

$\mathrm{Pa}=+3,\,+4,\,+5$

$U=+3,\,+4,\,+5,\,+6$

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