Atomic Structure: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Atomic Structure. Understanding the underlying formula is key to arriving at the correct answer below:

For an electron in an orbit, kinetic energy is equal to the negative of total energy: $K = -E = -(-3.4 eV) = 3.4 eV$. Potential energy is twice the total energy: $U = 2E = 2 \times (-3.4 eV) = -6.8 eV$.