Which of the following elements is placed just after actinide series?

Rutherfordium

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Unnilpentium

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Unnilquadium

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Ununbium

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Solution

The correct options are
A Unnilquadium
C Rutherfordium
Actinide series starts with actinium (Z=89) and contains fourteen elements from thorium (Z=90) to lawrencium (Z=103). This is followed by Rutherfordium (Z=104). There Rutherfordium (Z=104) also known as Unnilquadium.
Hence, both a and c are the correct option.

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Which of the following elements belongs to actinide series?

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