A hydrogen-like ion is an ion containing only one electron

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A hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by

E _n = −(2.18 × 10⁻¹⁸J) Z² (1/n²)

where n is the principal quantum number and Z is the atomic number of the element.

Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg⁸⁰⁺. Use the equation above to calculate the energy required for the last ionization step:

 Hg⁷⁹⁺(g) → Hg⁸⁰⁺(g)+ e⁻

kJ/mol