Answer:
Ba -> Ba2+ + 2e-
Step-by-step explanation:
A neutral atom becomes an iron when that atom loses electrons. The number of electroms lost by that atom determines the ionic charge or charge of it's ion. In this case, a neutral Barium atom (Ba) will become a barium ion, which has a charge of +2, when it loses 2 electrons to a more electronegative atom in a reaction.
The equation is:
Ba -> Ba2+ + 2e-
2e- is the two electrons lost