Energy level

Definition

Energy levels are the fixed energies that electrons can have within an atom. These levels determine the electron's distance from the nucleus and influence atomic interactions.

5 Must Know Facts For Your Next Test

1. Electrons occupy energy levels in a quantized manner, meaning they can only exist at specific energy states.
2. When an electron absorbs energy, it can transition to a higher energy level; this process is called excitation.
3. Energy levels are denoted by principal quantum numbers (n) which indicate the relative size and energy of the orbital.
4. The difference in energy between two levels corresponds to the wavelength of light emitted or absorbed, forming spectral lines.
5. The lowest energy level (n=1) is known as the ground state, where electrons are most stable.

Review Questions

• What determines the specific energies that electrons can have within an atom?
• How does an electron transition between different energy levels?
• What is indicated by the principal quantum number (n) in relation to energy levels?

Related terms

Photon: A particle representing a quantum of light or other electromagnetic radiation carrying energy proportional to its frequency.

Absorption Spectrum: A spectrum of absorbed wavelengths where dark lines appear against a continuous background when atoms absorb specific energies.

Ground State: The lowest energy state of an atom where all electrons are in their lowest possible energy levels.