Cyanocobalamin is the most common and widely produced form of the chemical compounds that have vitamin B12 activity.
For example, the hadron constituents of atomic nuclei, neutrons and protons, have charges of 0 e and +1 e respectively; the neutron is composed of two down quarks and one up quark, and the proton of two up quarks and one down quark.
Quatr.us > Chemistry > Atoms > Quarks. May 2016 - Quarks and electrons are the tiniest particles. There are three quarks in every proton and three in every neutron, and protons and neutrons are the pieces of an atom. We can't see a quark, even with an electron microscope, but we know they must exist because that's the only way to explain what happens when scientists do certain experiments.