Wow thanks for the feedback everyone! I put up a few polls not long ago and I already have quite a bit of votes.
now lets see
i think this card should be gravity and its ability entropy
gravity because no other element fits better
and for the skill entropy for the same reason of Aves
Why does no other element fit this card better? could you please elaborate. And yes Aves had a good point on the entropy ability.
another idea is leave ability 
and make card a Duality.
Diseric (http://elementscommunity.org/forum/index.php?action=dlattach;topic=29957.0;attach=2859;image)
Not a bad thought, but I am thinking it is a somewhat unnecessary complication (even though it technically makes the card easier to play) because the card only costs 2 quanta right now. If I made it a duality I would probably end up bumping up the price, not to mention then I would have 3 elements in a single card. That would make things a little overly complected in my opinion.
Ahem. So, 3 choices here. 
, , 
Here's my take.
Gravity is a fundamental force... but it is not the only fundamental force (The others being the strong interaction, the weak interaction, and electromagnetism). In Elements, Gravity deals with mass and gravity.
Entropy has to do with thermodynamics, and also the weak interaction. It deals with the decay of systems. In fact, without entropy, we could say that everything is immaterial, because nothing would decay- systems wouldn't lose energy, and so forth. In Elements, Entropy has taken on the role of probability (randomness/duality, quantum mechanics).
The Atom is more related to the Strong interaction (strong nuclear force) and the electromagnetic force, as they are what keep atoms together (the strong interaction holding the nucleus together, the electromagnetic force attracting protons and electrons). Aether has a claim to the electromagnetic force- Spark, lightning, mindgate (the nervous system works by transmitting signals, i.e electrical pulses)
Thus, I support .
For the ability, I think it should be entropy, not gravity. Gravity attracts all matter, yes, but it is entropy that causes nuclear reactions. In this case, extreme amounts of energy overwhelming the electromagnetic force and forcing the two nuclei together. Remember- Supernova is an card.
Btw, you should make two polls for this- one for the element of the card, one for the element of the skill.
I never really responded to this. First off this was a big help as I stated earlier. Secondly I didn't really think of entropy when considering the card's ability, only the card itself. In fact it seems like that would work perfectly. Right now I am going to let my poll decide what happens. It is a close run between two different card possibilities right now. I will pick the winner in 10 days.
