You get a mixture of hydrogen and xenon.
In the absence of other things, you will get xenon tetrafluoride.
It gets softer.
h
Hydrogen, H2, and a salt are formed.
You just get a gas mixture of argon and hydrogen. Being less dense, the hydrogen will rise above the argon.
In the absence of other things, you will get xenon tetrafluoride.
water
A mixture of xenon and radon.
It gets softer.
h
Hydrogen, H2, and a salt are formed.
Iodine crystals
BOOM.
Neptunium react with hydrogen forming hydrides with formulas between NpH2 and NpH3.
Nothing will happen. Helium is completely nonreactive.
You just get a gas mixture of argon and hydrogen. Being less dense, the hydrogen will rise above the argon.
All gases can mix with one another.