Question

Explain the pale yellow colour of fluorine.

Answer 1

1. The pale yellow colour of fluorine is due to its molecules absorbing light in the visible region.
2. When fluorine molecules absorb high-energy violet light, their outer electrons get excited to higher energy levels.
3. Since fluorine atoms are very small, they require high energy for this excitation.
4. As a result, fluorine absorbs violet light and shows the complementary colour, which is pale yellow.
5. This explains why fluorine has a pale yellow colour compared to other halogens like chlorine or iodine, whose colours are darker due to lower excitation energies lasting longer wavelengths.