Answer:
Oxygen
Explanation:
· Air decolorization makes use of chromophores’ instability on oxygen to decolorize the oil by air-oxidizing pigments. For example, the carotenoid and chlorophyll in the oil are very unstable because of their structure, which is easy to be discolored under the action of oxygen. However, air decolorization leads to thermal oxidation of the oil, too.
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I would say the first three. But I'm not 100% sure. I'm truly sorry if it's wrong
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1 to 1. Most small atoms have the same number of protons and neutrons