What is ionisation energy?

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(N/A) Ionisation energy is defined as the minimum amount of energy required to remove an electron from an atom in its ground state to an infinite dist

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(N/A) Ionisation energy is defined as the minimum amount of energy required to remove an electron from an atom in its ground state to an infinite distance from the nucleus,effectively placing it in a state where it is no longer bound to the atom.
For a hydrogen atom,the energy of the ground state $(n = 1)$ is $E_1 = -13.6 \ eV$.
To ionise the atom,we must provide enough energy to bring the total energy to $0 \ eV$ (the energy of an electron at infinity).
Therefore,the ionisation energy is $E_{\infty} - E_1 = 0 - (-13.6 \ eV) = 13.6 \ eV$.

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