There are a lot of things in life that we cannot live without but the most important of all would be oxygen. You can survive without food and water for some time but without oxygen surviving a minute would be tough. We have never seen it so we have assumed it to be colourless, yes it is colourless and we have even read about it the books. But when oxygen is converted into other states then the actual colour of the element comes out. In scientific terms, Oxygen has the atomic number 8 and is denoted by the symbol O.
When oxygen is in the gaseous state then it is colourless, odourless, and tasteless but in liquid and solid state the colour of Oxygen is pale blue. Yes, you might have no idea about this but it is true and there are other forms of oxygen as well and those appear in different colours. The colours are red, black, and metallic. But the pure oxygen compound has the pale blue colour and it is strongly paramagnetic. Most of the people who have ready chemistry know about this basic stuff, but the common people have less idea about it.
Why it has a pale blue colour has an explanation by a Quora user, “The two unpaired electrons in its outermost orbital. The electrons both create a magnetic assymetry in the oxygen molecules and absorb light in the red portion of the visible spectrum. This light absorbtion is a two-molecule/one-photon transition with a wavelength of 630 nm. A similar effect (also known as Tyndall effect) happens when you put flour in water and it turns blue because this color is scattered more than red. This time red isn’t absorbed but blue is more predominant (similar to why the sky is blue btw).”
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