Its either:
1. elemnts put together
2. Atoms put together
Real answer:
#1
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Invisible gas does not fit into the categories of metal or nonmetal. It is a state of matter that refers to gases that are not visible to the naked eye. Many elements in the periodic table can exist in the form of invisible gases, such as hydrogen, oxygen, nitrogen, and carbon dioxide.
Gas is a form of matter that can be invisible because it takes the shape of its container and does not always interact with light to reflect or absorb it. This makes it difficult to see compared to solids and liquids.
Dark matter is not visible to the naked eye and does not emit, absorb, or reflect light, so it does not have a color like visible matter. It remains invisible and undetectable through traditional telescopes, which is why it is called "dark" matter.
Gas can sometimes be visible with the example of smoke from a cigarette but it is also invisible as in the case of carbon monoxide which could not be seen or smelled.
Is oxygen a form of mixture form, compound form, or mixture form