Someone helpp me pleaseee

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

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal