Why is the charge of zinc ion Zn 2?

Zinc has an electron configuration of [Ar] 3d10 4s2. On the fourth (and outermost) electron shell, Zinc has only two electrons before coming to a closed n=3 shell. The closed shell is very stable, so changes in electrons usually happens at the 4s2 shell. read more

In any atom usually there is an equal number of protons and electrons, during bonding Zinc loses 2 of its outer most electrons in bond formation, this make the number of protons greater than that of electrons, thus, the overall charge on the ion being +2. read more

ZINC cation is an enzyme that catalyzes the HYDROLYSIS of terminal, non-reducing alpha-D-mannose residues in alpha-D-mannosides. The enzyme plays a role in the processing of newly formed N-glycans and in degradation of mature GLYCOPROTEINS. read more