Ion

Definition

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net electrical charge. Ions are crucial in the formation of spectral lines when atoms interact with radiation.

5 Must Know Facts For Your Next Test

1. Ions are created when atoms gain or lose electrons due to high energy interactions.
2. The presence of ions can alter the spectral lines emitted by a substance.
3. Ionization levels can indicate the temperature and density of astronomical objects like stars and nebulae.
4. Different elements ionize at different energy levels, affecting their spectral characteristics.
5. Spectral lines from ions provide information about the chemical composition and physical conditions of celestial bodies.

Review Questions

• How does an ion differ from a neutral atom?
• Why are ions important in the study of astronomical spectra?
• What information can be obtained by analyzing the spectral lines of ions?

Related terms

Electron: A subatomic particle with a negative charge that orbits the nucleus of an atom.

Spectrum: The range of electromagnetic radiation emitted or absorbed by an object, often displayed as a series of lines.

Ionization Energy: The amount of energy required to remove an electron from an atom or molecule to form an ion.