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Question

Which of the following exhibits only $$+3$$ oxidation state?


A
Th
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B
Ac
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C
Pa
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D
U
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Solution

The correct option is A $$Ac$$
The atomic number of $$Ac$$ is 89.

Electronic configuration $$=[Rn]6{d}^{1}7{s}^{2}$$

The stable oxidation state $$\Rightarrow +3$$

$$Th=+3, +4$$

$$Pa=+3, +4, +5$$

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

Hence, option $$B$$ is correct.

Chemistry

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