Question

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

A
Th
B
Ac
C
Pa
D
U

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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