### Short Answer

#### 22.1 The Structure of the Atom

Why do Bohrâ€™s calculations for electron energies not work for all atoms?

- In atoms with more than one electron is an atomic shell, the electrons will interact. That requires a more complex formula than Bohrâ€™s calculations accounted for.
- In atoms with 10 or more electorns in an atomic shell, the electrons will interact. That requires a more complex formula than Bohrâ€™s calculations accounted for.
- In atoms with more than one electron in an atomic shell, the electrons will not interact. That requires a more complex formula than Bohrâ€™s calculations accounted for.
- In atoms with 10 or more electrons in an atomic shell, the electrons will not interact. That requires a more complex formula than Bohrâ€™s calculations accounted for.

#### 22.2 Nuclear Forces and Radioactivity

- no
- yes

#### 22.3 Half Life and Radiometric Dating

- The radioactive activity decreases exponentially.
- The radioactive activity undergoes linear decay.
- The radioactive activity undergoes logarithmic decay.
- The radioactive activity will not change with time.

#### 22.4 Nuclear Fission and Fusion

- Heavy nuclei require more neutrons to achieve stability.
- Heavy nuclei require more neutrons to balance charge.
- Light nuclei require more neutrons to achieve stability.
- Light nuclei require more neutrons to balance charge.

#### 22.5 Medical Applications of Radioactivity: Diagnostic Imaging and Radiation

- Radioactive iodine can be used by the thyroid while absorbing information about the thyroid.
- Radioactive iodine can be used by the thyroid while emitting information about the thyroid.
- Radioactive iodine can be secreted by the thyroid while absorbing information about the thyroid.
- Radioactive iodine can be secreted by the thyroid while emitting information about the thyroid.