If you compare the strength of the gravitational attraction between the proton and electron in a Hydrogen atom to electro magnetic force, then gravity is negligible. Or as my physics teacher once put it, while picking up a book: &quot;There is an entire planet pulling on the book, but I win.&quot;<p>So yes, Gravity is the most important force, but that is a consequence of the existence of positive and negative charges, not of the strength of gravity.