Ray of light originating from the light source-

Theoretically, which metal should be the most reactive? hydrogen lithium francium fluorine

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out