Question

What is the IUPAC nomenclature 118 atomic number ?

• A. Ununoctium
• B. Unniloctium
• C. Ununcotum
• D. Ununeightium

Answer 1

The correct option is A Ununoctium

Number	Root
0	nil
1	un
2	bi
3	tri
4	quad
5	pent
6	hex
7	sept
8	oct
9	enn

1. The name is derived directly from the atomic number of the element using the above Latin numerical roots.
   
2. The roots are put together in the order of the digits which make up the atomic number and terminated by 'ium' to spell out the name. The final 'n' of 'enn' is elided when it occurs before 'nil', and the final 'i' of 'bi' and of 'tri' when it occurs before 'ium'.
3. The symbol of the element is composed of the initial letters of the numerical roots which make up the name.
4. The root 'un' is pronounced with a long 'u', to rhyme with 'moon'. In the element names each root is to be pronounced separately.

5. Element with atomic number 118 is named as Ununoctium (Uuo).