question_answer 29)

  The simple Bohr modle is not applicable to He4 atom because (a) He4 is an inert gas (b) He4 has neutrons in the nucleus (c) He4 has one more electron (d) electrons are not subject to central forces

Answer:

  2He4 atom has two electrons. Simple Bohr model applies only to one electron atom (H-atom). It does not apply to He4 because it possesses one more electron. Further, these electrons are not subject to central forces. Choices (c) and (d) are correct