Lesson Worksheet: Energy Levels in the Bohr Model Chemistry • 10th Grade

In this worksheet, we will practice using the Bohr model to calculate the energies of electron shells in hydrogenic atoms.

Q1:

The electron in the 𝑛=3 energy level of a Li2+ ion absorbs a photon and is promoted to the energy level with 𝑛=6. In which of the following transitions would an electron absorb a photon of the same energy?

  • APromotion of an electron from 𝑛=2 to 𝑛=8 in the He+ ion
  • BPromotion of an electron from 𝑛=2 to 𝑛=4 in the He+ ion
  • CPromotion of an electron from 𝑛=2 to 𝑛=4 in the hydrogen atom
  • DPromotion of an electron from 𝑛=2 to 𝑛=8 in the hydrogen atom
  • EPromotion of an electron from 𝑛=1 to 𝑛=2 in the He+ ion

Q2:

Which of the following ions would have the same ionization energy as a hydrogen atom with an electron in the 𝑛=4 energy level?

  • AA Li2+ ion with an electron in the 𝑛=18 energy level
  • BA Li2+ ion with an electron in the 𝑛=12 energy level
  • CA He+ ion with an electron in the 𝑛=12 energy level
  • DA He+ ion with an electron in the 𝑛=6 energy level
  • EA Be3+ ion with an electron in the 𝑛=18 energy level

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