If Ununoctium could be perhaps denser than water

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The discussion centers on the possibility of gases being denser than water, sparked by observations of various noble gases in balloons. Helium and neon float, while argon and krypton exhibit varying buoyancy, with xenon notably sinking quickly, earning it the nickname "The Lead Balloon." The conversation shifts to ununoctium (element 118), speculating on its density. Calculations indicate that ununoctium has a theoretical density of 13.13 g/L at standard temperature and pressure (STP), which is still less than water's density of 1 kg/L. The rarity of ununoctium, with only a few atoms synthesized and a very short half-life, limits practical exploration of its properties. The thread concludes with a light-hearted remark about the revival of an old topic.
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I was wondering, is it possible to have a gas denser than water? I once saw a video where they had 6 balloons. The first contained Helium and when released, it floated to the ceiling. The neon did the same. Argon slowly floated down. Krypton was interesting to see but not as much as the Xenon. The Xenon fell stait to the ground without a bounce as it is nicknamed, "The Lead Balloon". They had no Radon although. :frown: . I'm assuming if one were to follow the pattern, Radon would be rediculusly sink and that lead me to wonder if Ununoctium could be perhaps denser than water. Any thoughts?
 
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Well, under the right circumstances many gasses are denser than water, such as in a tank of compressed gas.
 
I meant in its natural state
 
Ununnonium said:
and that lead me to wonder if Ununoctium could be perhaps denser than water.
Why would you assume it to [possibly] be more dense than water?
Water, after all, is fairly dense (1 kg / Liter).

If we approximate the gas to be an ideal gas (and what better gas to approximate this on than a noble gas), then we can estimate its density at STP by assuming that 1 mole of the gas has a volume of 22.4 Liters.
1 mole of the element #118 (provisionally named, "Ununoctium") has a molar mass of 294 g/mol of its theoretical most stable isotope.

Density = mass / volume
For 1 mole at STP,
Density = (294 g) / (22.4 Liters)
Density = 13.13 g/Liter
Which is a pretty high density for a gas, but it is still well below the density of water.
 
So it is possible to have a bubble under water?
 
Ununnonium said:
So it is possible to have a bubble under water?
Where else do you usually have bubbles...? :rolleyes:

[sorry couldn't resist]
 
:) A sinking bubble?
 


Ununnonium said:
I was wondering, is it possible to have a gas denser than water? I once saw a video where they had 6 balloons. The first contained Helium and when released, it floated to the ceiling. The neon did the same. Argon slowly floated down. Krypton was interesting to see but not as much as the Xenon. The Xenon fell stait to the ground without a bounce as it is nicknamed, "The Lead Balloon". They had no Radon although. :frown: . I'm assuming if one were to follow the pattern, Radon would be rediculusly sink and that lead me to wonder if Ununoctium could be perhaps denser than water. Any thoughts?

According to that trend, ununoctium could be denser than water but we would probably not know since the only ununoctium ever synthesized was only 3 (mabye 4) atoms of Ununoctium-294 with a half-life of 890 microseconds.
That is a very interesting idea though.
 


Way to revive a 4 year old thread. lol
 

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