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Among the following actinoids, the one that is known to exhibit the highest oxidation state of $+ 7$ is

A $Th$
B $Cm$
C $Np$
D $Lr$

Answer: C

Neptunium (

5 f^{4} 6 d^{1} 7 s^{2}

) has seven valence electrons and can reach +7. Thorium is limited to +4, curium is mainly +3 and lawrencium is +3.

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