Wee Little Fluorine, runs through the town,
Looking for electrons, Upstairs and down.
Electronegativity’s as high as it can get,
She just needs one electron to have a full octet.
Searching all over, for atoms to attract,
A hyperactive halogen, she just wants to react.
If you are a metal, better run and hide.
Or she will ionize you, and make you a fluoride.