The first method would require energy equivalent to dozens of Large Hadron Colliders-an impressive and extremely treacherous experiment indeed =P. The second method would be putting together a chunk of each element and observe what happens.
Both, however, would eventually create carbon monoxide and a pile of rust and salts rather than a cool Frankenstein element.
Oxygen, for example, is very reactive, and if it is closest to hydrogen, it will make hydroxide. If it is nearest to carbon, it will make carbon monoxide. Certain elements, such as the noble gases, wouldn’t react with anything.
Another approach would be to toss a pulverized chunk of each element or a puff of each gas into a sealed container and observe the consequence. No one has ever tried this experiment either, but here’s how scientists think things would play out: The oxygen gas would react with alkaline metal (lithium or sodium) and ignite, raising the temperature in the container to the point that even Devil himself would complain. There are roughly 25 radioactive elements, and they would make your flaming stew a little dangerous. Flaming plutonium is a very bad thing-inhaling airborne radioactive material can cause rapid death.
Cool huh? =P