1  2  3 

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3  _  _  _


ACROSS
1)  the residue that remains when something is burned
2)  a small cube with 1 to 6 spots on the six faces; used in gambling to generate random numbers
3)  a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium


DOWN
1)  an enzyme found in mammals that can catalyze the deamination of adenosine into inosine and ammonia
2)  be seated
3)  a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in texas and kansas)

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