I wish to know whether gravity has any effect on atoms? And if so to what extent ?
well atoms have mass so gravitation naturally affects them. but it's usually neglible.
Gravity acting on atoms is pretty much what most of our observable universe is all about.
The sum total of gravititational pull from each individual atom in the Earth acting upon each individual atom in the Moon is what keeps the Moon in orbit.
In a vacuum at the earth's surface gravity accelerates each atom at the rate of about 9.8 meters per second^2 toward the surface.
If you find any atoms that have a different rate of fall please let me know!
the gravitational interaction is not only driven by particle's having mass. Energy is also a factor. In GR, spacetime is curved by the stress energy tensor, you know. Just look at the right hand side of the Einstein tensor-equation.
Besides, did you guys know that gravity DOES have quantum like properties 
 V.V Nesvizhevsky et al., Nature v.415, p.297 (2002)
Frome the little that is known about, "quantum gravity", i would say that is a bold statment, What are the facts ?
read the paper.
besides, what exactly do you understand by quantum gravity. this is a term that is very often misinterpreted. we are not dealing with quantization, or whatever, of spacetime here
Oh thank the stars, a scientific paper with no strings attached.
it is a Nature paper man
Besides, have you read the references in that paper, hmm ?
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