Question

How can we name the element with atomic number 118 according to IUPAC nomenclature?

• A. Unniloctium
• B. Ununennium
• C. Ununoctium
• D. Unoctoctium

Answer 1

The correct option is C

Ununoctium

According to the IUPAC nomenclature, elements after 100 is named using the Latin numerical words of the atomic number.

$\begin{array}{cc}\text{NUMBER}& ROOT\\ \text{0}& nil\\ \text{1}& un\\ \text{2}& bi\\ \text{3}& tri\\ \text{4}& quad\\ \text{5}& pent\\ \text{6}& hex\\ \text{7}& sept\\ \text{8}& oct\\ \text{9}& enn\end{array}$

The roots are placed according to the digits of atomic number and finally terminated using "ium".

Here, the atomic number is 118. The root word corresponding to 1 is "un" and the root corresponding to 8 is "oct".

The name of the 118th element is Ununoctium.