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Answer:
Red.
Explanation:
First, let's review the concept of atomic emission: Atomic emission occurs when a valence electron in a higher energy atomic orbital returns to a lower energy atomic orbital.
This gives us a spectrum that has different frequencies based on the colors (the frequency of the wavelength is related to the color of light).
You can note that the order of these frequencies based on the color from minor to major is:
Red < orange < yellow < green < blue < indigo < violet.
As you can see red would be the smallest energy of electron transition because its frequency is the smallest.
The answer would be Red.