Final answer:
Cobalt (Co) has 27 protons, and a cobalt ion with a +2 charge (Co2+) has 25 electrons.
Step-by-step explanation:
The question asks about the number of electrons and protons in a cobalt ion with a +2 charge (Co2+). Cobalt (Co) has an atomic number of 27, which means it has 27 protons. The ion Co2+ has lost 2 electrons compared to a neutral cobalt atom. Therefore, Co2+ has 27 protons and 25 electrons. The positive charge of the protons is partially cancelled out by the negative charge of the electrons, and the 2+ charge indicates that there are two more protons than electrons.