BRAINCAKEFirst Ionisation 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
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Key terms in this lesson
- Mole
- The amount of substance that contains as many particles as there are atoms in exactly 12g of carbon-12.
- Atomic radius
- A measure of the size of an atom, found by measuring the distance between two adjacent nuclei and dividing by two.
More in Periodicity
- Reactivity
- Hydrogen and Helium
- Periodicity and Period 3 Elements
- Trends in Melting and Boiling Points
- Atomic Radii
- Group 2 and 3
- Group 5 and 6
- Successive Ionisation Energies
All 14 lessons in Periodicity · All AQA AS-level Chemistry topics