Which of the following is not always written as a diatomic molecule;

The one that is not written as a diatomic element is Sulfur.

A good acronym for the diatomic elements is.


I - Iodine
Hope - Hydrogen
Our - Oxygen
Class - Chlorine
Brings - Bromine
No - Nitrogen
F's - Flourine
 
Well, diatomics are two molecules/elements either the same or different. So, these are either H2, S2 and F2, then they are diatomics, but I believe you mean H, S and F then they are not.
 
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