Ions huh?

So, there are two atoms. One is running along the sidewalk at the front of a building toward the street corner, the other atom is running up the side of the same building toward the street corner. Being unable to see each other, they collide at the corner. The first atom asks, "Are you okay."
The second atom replies, "No, I think I lost an electron."
The first asks, "Are you sure?"
The second says, "Yeah, I'm positive."

Please, no death threats via PMs for that one