Which element was originally represented by the Bohr model when it was first proposed?

• A. Helium
• B. Lithium
• C. Hydrogen
• D. Oxygen

Answer: (C)

Verified step by step guidance

1. Understand that the Bohr model was proposed by Niels Bohr in 1913 to explain the atomic structure and spectral lines of a specific element.
2. Recall that the Bohr model was initially developed to describe the hydrogen atom, which is the simplest atom with one proton and one electron.
3. Recognize that the model introduced quantized energy levels for the electron orbiting the nucleus, explaining hydrogen's emission spectrum.
4. Note that while the Bohr model can be extended to other elements, its original and primary application was to hydrogen.
5. Conclude that the element originally represented by the Bohr model when it was first proposed is hydrogen.