How many elements are in gaseous state at room temperature?
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At room temperature (around 20°C), there are 11 elements that exist in the gaseous state. These are:
Interestingly, all of these elements except radon belong to the group 18 (noble gases) of the periodic table. Noble gases have completely filled valence electron shells, making them highly stable and unreactive, thus explaining their gaseous state at room temperature. Radon, while not a noble gas, shares similar properties due to its large size and weak interatomic forces.
So, the next time you experience a cool breeze or take a deep breath, remember that you’re interacting with some of the fundamental building blocks of the universe, most of which prefer to hang out in the gaseous state at room temperature!