Cs⁺ ion imparts violet colour to the flame. This is due to the fact th...
Cs⁺ ion imparts violet colour to the flame due to high energy emitted radiations. This phenomenon is known as flame test.
Explanation:
Flame test is a qualitative test used to identify the presence of certain metal ions in a sample by observing the colour of the flame produced when the sample is introduced into the flame. When a metal ion is introduced into the flame, the electrons of the metal atoms get excited to higher energy levels. Then, the electrons return to their ground state by emitting energy in the form of light. The wavelength of the emitted light depends on the difference in energy levels of the excited and ground states.
Cs⁺ ion has a valence electron configuration of [Xe] 6s¹. When this ion is introduced into the flame, the electrons in the 6s subshell get excited to higher energy levels. The energy difference between the excited and ground states corresponds to the violet region of the electromagnetic spectrum. Therefore, Cs⁺ ion emits violet-coloured light when introduced into the flame.
The emitted radiations have high energy because the energy difference between the excited and ground states of Cs⁺ ion is large. This high energy corresponds to the violet region of the electromagnetic spectrum. Hence, Cs⁺ ion imparts violet colour to the flame.
Conclusion:
Cs⁺ ion imparts violet colour to the flame due to the emission of high energy radiations. Flame test is a qualitative test used to identify the presence of certain metal ions in a sample by observing the colour of the flame produced when the sample is introduced into the flame.
Cs⁺ ion imparts violet colour to the flame. This is due to the fact th...
Wavelength is inversely proportional to temp. or energy, and violet color have less wavelength hence its energy is more than red color but less than blue color.