I am not sure what the argument is but since everbody relies on Google - check a few:

Howstuffworks "How does gravity work?"The question of why atoms attract one another is still not understood. The goal is to combine gravity, electromagnetism and strong and weak nuclear forces ...
science.howstuffworks.com/question232.htm - 35k - Cached - Similar pages


Light, Atoms, Galaxies and GravityThe concept that energy may act to create charges independent of particles leads to new models for the photon, atoms, and gravity.
www.petcom.com/~john/ - 17k - Cached - Similar pages


Does gravity affect atoms?Does gravity affect atoms? ... Gravity affects atoms the same way it affects all other matter. Every atom creates its own gravitational field which attracts ...
education.jlab.org/qa/atomgravity_01.html - 6k - Cached - Similar pages

It's not for me to say!
jjw