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**Question 7**

Hydrogen has a ground state energy of \( E_0 = -13.6 \, \text{eV} \). A helium atom (\( Z = 2 \)) with only one electron will have a ground state energy of:

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a. \( \frac{E_0}{4} \)

b. \( \frac{E_0}{2} \)

c. \( E_0 \)

d. \( \frac{2E_0}{3} \)

e. \( \frac{4E_0}{9} \)

(Note: Option "b. \( \frac{E_0}{2} \)" is highlighted.)

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