Using the values of various constants given in the preface, we can calculate the gravitational force on a hydrogen atom due to the earth:
Fgrav = mg = (1.7x10⁻²⁷ kg)(9.8N/kg)= 1.7x10⁻²⁶N

How does the magnitude of the electric force binding the hydrogen atom together compare to the gravitational force exerted by the entire earth on the hydrogen atom?