Yes.
it floats because the xenon gas particles are heavier that the aluminum foil's.
No it does not
Xenon is more than 4.5 times heavier than air.
When compared by volume, copper is best, then aluminum and finally iron. When compared by weight, aluminum is better than copper. You have to compare by volume because aluminum is so much lighter than copper, an aluminum wire that weighed the same as a copper wire would be much bigger and harder to work with.
Radon is a very dense gas - 9,73 g/cm3, denser than xenon.
because Xenon has more polarizable electrons.
Octane is the only thing that can be decomposed by chemical means.
Yes, it is.
It is as 'big' as 0.01 mole Al (not the 'rodent' mole, that's much bigger than 0.27 g!)
No. Xenon is highly unreactive. Xenon will, under special circumstances, react with elemental fluorine, which is much more reactive than fluorides.
LED lights use less energy than Xenon lights and last much longer. They are also far more affordable than Xenon lights and come in a range of color levels that are less harsh than Xenon.