Assertion (A): The IUPAC name of the element Dubnium is unnilpentium.
Reason (R) : Atomic number of the Dubnium is 105.

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Both A and R are true and R is the correct explanation of A

Both A and R are true and R is not correct explanation of A

A is correct and R is incorrect

A is incorrect and R is correct

answer is A.

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Detailed Solution

To naming the elements whose atomic number Z) is greater than 100, use IUPAC. For the element with atomic number 105 IUPAC name is unnilpentium and regular name is “Dubnium”.

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