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chem: fix equation latex

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eggy 2020-09-29 13:48:58 -04:00
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@ -160,10 +160,10 @@ The atomic radius of an atom is the distance from the centre of the nucleus to a
### Ionisation energy
The first ionisation energy of an element is the minimum amount of energy required to remove one mole of electrons from one mole of *gaseous* atoms to form a mole of gaseous ions, so that
$$Q_{(g)} \rightarrow Q_{(g)}^+ + e^-$$
$$\text{Q}_\text{(g)} \rightarrow \text{Q}_\text{(g)}^+ + \text{e}^-$$
Any subsequent ionisation energies of an element are the minimum amount of energy required to remove one *additional* mole of electrons. For example, the second ionisation energy would involve
$$Q_{(g)}^- \rightarrow Q_{(g)}^{2+} + e^-$$
$$\text{Q}_\text{(g)}^- \rightarrow \text{Q}_\text{(g)}^{2+} + \text{e}^-$$
It requires vastly more energy to remove an electron from a filled valence shell compared to an unfilled valence shell.