Quarks are
A A Fact
B Fiction
C Both of the above
D Neither of the above

I’d say A. They are theoretical in the fact that they have not been observed directly, but have been confirmed to exist through experimentation.

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.