Edexcel IAL Chemistry 2.8 Ionisation energy definitions

Identify which electron is removed from which gaseous ion, increase the ionic charge by one and include one electron with balanced charge and state symbols.

Exam points

Define first ionisation energy for one mole of gaseous atoms and electrons removed.
Write first, second or third ionisation equations with gaseous ions and electrons.
Explain when a further ionisation is impossible because no electron remains.

[Maximum number: 2]

Ionisation energies provide information about the orbitals in the electronic structures of atoms.

Write the equation for the second ionisation energy of fluorine.

Include state symbols.

equation

- state symbols

(1)

(1)

Example of equation
$\mathrm{F}^{+}(\mathrm{g}) \rightarrow \mathrm{F}^{2+}(\mathrm{g})+\mathrm{e}^{(-)}$

Allow

$\mathrm{F}^{+}(\mathrm{g})-\mathrm{e}^{(-)} \rightarrow \mathrm{F}^{2+}(\mathrm{g})$

Ignore state symbols on the electron

Allow TE for M2 is if the $1^{\text {st }}$ or $3^{\text {rd }}$ ionisation equation is shown.

(2)

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2.8—Define first, second and third ionisation energies and understand that all ionisation energies are endothermic question 1