An electron drop to what energy level is likely to emit a photon in the infrared region?

Hydrogen or what?

They didn't say.. They just asked for the energy level that will emit a photon in an infrared region

To determine the energy level at which an electron is likely to emit a photon in the infrared region, we can use the concept of energy transitions in atoms.

Electrons in an atom occupy specific energy levels, also known as shells or orbitals. These energy levels are quantized, meaning they can only take on certain discrete values. When an electron transitions from a higher energy level to a lower energy level, it releases energy in the form of a photon.

The energy of a photon is related to its wavelength or frequency, which determines its position in the electromagnetic spectrum. Infrared radiation is characterized by longer wavelengths and lower frequencies compared to visible light.

Based on this information, when an electron transitions to a lower energy level and emits a photon in the infrared region, it suggests that the initial energy level of the electron is relatively higher.

The specific energy levels of electrons in an atom are described by quantum numbers and atomic orbital configurations. To determine the exact energy level at which the transition occurs, one would need to know the specific electronic configuration of the atom in question.

Therefore, without additional information about the atom, it is not possible to definitively state the exact energy level at which an electron will emit a photon in the infrared region. However, based on the general understanding, it is likely to be a transition from a higher energy level to a lower energy level within the atom.