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Electromagnetic radiation is a type of energy released and absorbed by charged particles, such as electrons, in the form of oscillating electric and magnetic fields. This radiation can be characterized by a wavelength (the distance between two consecutive peaks or troughs) and frequency (the number of oscillations per second). Some common examples of electromagnetic radiation include visible light, radio waves, microwaves, and X-rays.

When electromagnetic radiation comes into contact with atoms, one of three processes can occur: absorption, reflection, or transmission. In the case of absorption, the energy from the radiation is absorbed by the electrons in an atom, causing them to become excited and jump to higher energy levels (or orbitals). Conversely, when electrons in an atom drop from a higher energy level to a lower one, they release energy in the form of electromagnetic radiation. This process is known as emission.

The interaction between electromagnetic radiation and atoms has played a crucial role in understanding the arrangement of electrons in atoms. In the early 20th century, scientists observed that when a sample of atoms is excited (e.g., by heating or applying an electric field), it emits light at specific wavelengths. This emission is called atomic spectra, which can be classified as either emission spectra or absorption spectra. The precise wavelengths of these spectra are unique to each element and depend on the allowed energy levels of their electrons. One of the most well-known examples of this is the hydrogen spectrum, which led to the development of the Bohr model of the atom. Niels Bohr proposed that electrons in a hydrogen atom can only occupy specific energy levels and that the emission spectra observed are a result of electrons transitioning between these levels. Although the Bohr model has been refined over the years with the introduction of quantum mechanics, it provided a groundbreaking foundation for understanding electron arrangement in atoms. In conclusion, the study of electromagnetic radiation has been essential in understanding the arrangement of electrons in atoms. By observing how atoms absorb and emit electromagnetic radiation, scientists have been able to deduce key principles regarding the allowed energy levels and structure of atomic electrons, leading to continuous advancements in our understanding of atomic theory.