Give the number of electrons in the species H+2, H2, and O+2.

The number of electrons in the species H+2, H2, and O+2 are 1, 2, and 15 respectively. As hydrogen ion is having a positive charge, it represents the removal of one electron out of two. Hydrogen gas contains two hydrogen atoms having two electrons each. Oxygen ion having a positive charge indicates that out of 16 electrons of the oxygen atom, one is removed.