J. J. Thomson's plum pudding model and Niels Bohr's planetary model were early ideas about the structure of what?

J. J. Thomson's plum pudding model and Niels Bohr's planetary model were early ideas about the structure of what?

• A. Atom
• B. Molecule
• C. Electron
• D. Nucleus

Answer: (A)

These early ideas explore how matter is put together at the smallest scale. The plum pudding model envisions the atom as a uniform sphere of positive charge with electrons spread through it, aiming to describe the entire atom’s internal makeup. Bohr’s planetary model builds on the idea of a tiny central nucleus with electrons orbiting around it, again trying to explain the structure and behavior of the atom, such as spectral lines. They’re not about molecules (which are groups of atoms bonded together), not about a single electron, and not focused on the nucleus in isolation. They describe the structure of the atom as a whole.

These early ideas explore how matter is put together at the smallest scale. The plum pudding model envisions the atom as a uniform sphere of positive charge with electrons spread through it, aiming to describe the entire atom’s internal makeup. Bohr’s planetary model builds on the idea of a tiny central nucleus with electrons orbiting around it, again trying to explain the structure and behavior of the atom, such as spectral lines. They’re not about molecules (which are groups of atoms bonded together), not about a single electron, and not focused on the nucleus in isolation. They describe the structure of the atom as a whole.