Ionisation Energy
| Formula / Notation | IE_n: X^(n-1)+ (g) → X^n+(g) + e⁻; successive IEs always increase |
|---|---|
| Also Known As | Ionisation potential, IE, electron removal energy, IP |
What is Ionisation Energy?
The energy required to remove an electron from a gaseous atom or ion to form a positive ion. First ionisation energy is the energy to remove the outermost electron from a neutral atom. Successive ionisation energies show large jumps when inner shell electrons are removed.
Formula & Notation
Other Names / Synonyms: Ionisation potential, IE, electron removal energy, IP
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The energy required to remove an electron from a gaseous atom or ion to form a positive ion. First ionisation energy is the energy to remove the outermost electron from a neutral atom. Successive ionisation energies show large jumps when inner shell electrons are removed.
Ionisation energies are used in: Born-Haber cycle calculations (lattice energy determination), predicting oxidation states accessible to elements, understanding periodic trends in reactivity and metallic character, designing photoionisation detectors in chromatography, and calibrating photoelectron …
No direct safety concern for the concept. Elements with low IE₁ (alkali and alkaline earth metals) are dangerously reactive toward air and water because the valence electron is so easily removed. Knowledge of IE guides prediction of which metals react violently under normal conditions.
The formula or notation for Ionisation Energy is: IE_n: X^(n-1)+ (g) → X^n+(g) + e⁻; successive IEs always increase