Definition

Noun: 1. A specific, quantized energy level that a physical system, particularly a particle like an electron within an atom or molecule, can possess: In quantum mechanics, a system cannot have any arbitrary energy; it can only exist in specific, discrete energy states. The energy state defines the system's configuration and properties. 2. The condition of a system characterized by a particular energy value: It refers to one of the allowed stable conditions defined by a precise energy level.

Usage Examples

• Noun:
  • An electron can transition from a lower energy state to a higher one by absorbing a photon.
  • The molecule was excited into a higher energy state.
  • According to quantum theory, the possible energy states of an electron in an atom are fixed.

Advanced Usage

• "Ground state": The lowest possible energy state of a system.
  • When all electrons are in their lowest possible orbitals, the atom is in its ground state.
• "Excited state": Any energy state higher than the ground state.
  • Absorbing light can promote an electron from the ground state to an excited state.

Variants and Related Words

• Energy level (n): Often used synonymously with "energy state," particularly when describing the discrete levels in an atomic model.
  • The Bohr model depicts electrons orbiting at specific energy levels.
• Quantum state (n): A more general term describing the complete state of a quantum system, which includes its energy state as a key property.

Synonyms

• Quantum level
• Stationary state (in quantum mechanics, a state with a definite energy)

Related Phrases

• To occupy an energy state: To be in a particular energy level.
  • In a hydrogen atom, the electron normally occupies the lowest available energy state.
• Transition between energy states: The process of moving from one discrete energy level to another.
  • The emission of light occurs due to an electron's transition between energy states.

Noun

1. a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules
   • according to quantum theory only certain energy levels are possible