What does Bohr's model emphasize?

What does Bohr's model emphasize?

• A. Electron shells
• B. Electron clouds
• C. Nuclei in motion
• D. Protons orbiting the nucleus

Answer: (A)

Bohr's model emphasizes that electrons occupy specific energy levels, or shells, around the nucleus. In this view, electrons move in fixed, quantized orbits with set energies, not as a diffuse cloud. When an electron jumps between these levels, it emits or absorbs light with a precise energy corresponding to the level difference, which explains the distinct spectral lines seen in hydrogen. This focus on discrete energy levels around the nucleus distinguishes Bohr's idea from later quantum-mechanical pictures that describe electron distributions as clouds. The notion of protons orbiting the nucleus or the nucleus itself being in motion isn’t part of Bohr’s key idea.

Bohr's model emphasizes that electrons occupy specific energy levels, or shells, around the nucleus. In this view, electrons move in fixed, quantized orbits with set energies, not as a diffuse cloud. When an electron jumps between these levels, it emits or absorbs light with a precise energy corresponding to the level difference, which explains the distinct spectral lines seen in hydrogen. This focus on discrete energy levels around the nucleus distinguishes Bohr's idea from later quantum-mechanical pictures that describe electron distributions as clouds. The notion of protons orbiting the nucleus or the nucleus itself being in motion isn’t part of Bohr’s key idea.