Two atoms are walking down the street, and they run into each other. One says to the other, "Are you all right?" "No, I lost an electron!" "Are you sure?" "Yeah, I’m positive!"
The Lost Electron
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Explanation
Experiment
This is a pun. Losing an electron makes an atom positively charged, and 'positive' is also used to express certainty. So, the atom is saying it's sure it lost an electron, and is also making a science joke.