A highly ionized atom with $Z = 5$ has only one electron left around it, in its ground state. How much more energy is required to finish the job and have a bare nucleus?
A) $13.1 \mathrm { eV }$
B) $10.9 \mathrm { eV }$
C) $68.0 \mathrm { eV }$
D) $340.0 \mathrm { eV }$

Question

Quizplus · Accepted Answer

The energy required to ionize a hydrogen-like atom is given by $E = 13.6 \times Z^2$ eV. For $Z = 5$, $E = 13.6 \times 5^2 = 340.0$ eV.

A Highly Ionized Atom With Z=5Z = 5Z=5 Has Only One Electron Left Around It, in Its Ground

A Highly Ionized Atom With $Z = 5$ Has Only One Electron Left Around It, in Its Ground