In Bohr's atomic model, what does the quantum number n represent?

• A. The number of neutrons in the nucleus
• B. The charge of the nucleus
• C. The principal energy level or shell of an electron
• D. The number of electrons in the atom

Answer: (C)

Verified step by step guidance

1. Understand that in Bohr's atomic model, electrons orbit the nucleus in specific paths or shells.
2. Recognize that the quantum number \( n \) is called the principal quantum number.
3. Know that \( n \) indicates the principal energy level or shell where an electron is located.
4. Each value of \( n \) corresponds to a different energy level, with higher \( n \) values meaning electrons are farther from the nucleus and have higher energy.
5. Therefore, \( n \) does not represent the number of neutrons, the charge of the nucleus, or the number of electrons, but specifically the principal energy level or shell of an electron.