gas
Plasma
There are many reasons why people talk about the state of matter at room temperature. This is because it's the form it's found in.
Radon is a gas at room temperature, and quite a bit below it, too. A link can be found below.
Argon is a gas at room temperature. It is one of the noble gases with the stable noble gas configuration, and are colourless and odourless.
The Wikipedia lists about 17 states of matter. For example, the Bose-Einstein condensate is not found naturally - neither on Earth, or outside - because of the extremely low temperature required. However, it can be made in a laboratory on Earth. On the other hand, the special states of matter found in a white dwarf or a neutron star can not currently be reproduced on Earth.
Argon is a gas at room temperature. It is one of the noble gases with the stable noble gas configuration, and are colourless and odourless.
Hydrocarbons can be found in all states of matter.
At room temperature, Hafnium is in a solidstate.
Rivers
They can be found in the periodic table of matter
Matter is everywhere. Where there is no matter , it is a vacuum. You as a biological organism are matter.
oceans