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Problem
The energy of a hydrogen like atom (or ion) in its ground state is
−
122.4
-122.4
−
122.4
eV. It may be a. hydrogen atom b.
He
+
\text{He}^+
He
+
c.
Li
2
+
\text{Li}^{2+}
Li
2
+
d.
Be
3
+
\text{Be}^{3+}
Be
3
+
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