BRAINCAKEIonisation Energy
The first ionisation energy is the energy required to remove one electron from each atom in one mole of gaseous atoms of an element to for, one mole of gaseous +1 ions.
Na (g) → Na+(g) + e- +496kJmol-1
Sign in free to see the rest of this lesson, the R.E.C.I.P.E. recall steps and the quiz
BrainCake is free. Make an account in seconds and pick up where this page stops.
Key terms in this lesson
- Ion
- A positively or negatively charged atom or group of atoms, formed by the loss or gain of electrons.
- Ionisation
- The loss or gain of electrons by an atom or molecule to form a charged ion.
- Electron shell
- A main energy level occupied by electrons, given a principal quantum number n, with n = 1 closest to and lowest in energy relative to the nucleus.
- Mole
- The amount of substance that contains as many particles as there are atoms in exactly 12g of carbon-12.
More in Periodicity
- The Periodic Table
- Electron Configuration
- Successive Ionisation Energies
- Trends in First Ionisation Energies Across a Period
- Trends in First Ionisation Energies Down a Group
- Beryllium and Boron
- Nitrogen and Oxygen
- Metallic Bonding
All 14 lessons in Periodicity · All OCR AS-level Chemistry topics