What does the number 84 in the name krypton-84 represent?
b. atomic number
c. mass number
d. twice the number of protons

Why does his teacher ask him to balance the equation by including the correct coefficient

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 ?