Three of these are wrong. Find the one that holds.

Exercise and reference answers

Questions

1. Question

   Three of these statements about Bohr's model are false.

   Choices

   1. Item

      It explained the hydrogen spectrum

      Correct

      Yes

   2. Explanation

      It could not explain their spectra.

      Item

      It worked for multi-electron atoms

   3. Explanation

      Bohr treated the electron as a particle in an orbit.

      Item

      It included the electron's wave nature

   4. Explanation

      A definite orbit contradicts that principle.

      Item

      It agrees with the uncertainty principle

2. Question

   Three of these statements about Thomson's model are false.

   Choices

   1. Item

      Electrons embedded in positive charge

      Correct

      Yes

   2. Explanation

      That is Rutherford's picture, not Thomson's.

      Item

      It featured a dense central nucleus

   3. Explanation

      Alpha-particle scattering disproved it.

      Item

      It survived the scattering experiment

   4. Explanation

      Fixed orbits came later, with Bohr.

      Item

      It described fixed electron orbits

Explanation