EasyChemistryHigh School (9–10)GeneralStructure of the Atom › Subatomic Particles and Atomic ModelsConceptualBoard Exam
In a hydrogen atom, the L shell has an energy of -3.4 eV and the K shell has -13.6 eV…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In a hydrogen atom, the L shell has an energy of and the K shell has . An electron moves from the L shell to the K shell.
- Does the atom take in energy or give it out? Why?
- How much energy is involved?
- How much energy would send the electron back up to the L shell?
Need a reminder? The key ideaShow
In Bohr's model, electrons move only in fixed shells, K, L, M, N, each with a fixed energy. An electron in a shell does not lose energy. A jump to a higher shell takes in energy; a fall to a lower shell gives out the difference as light. In hydrogen, the levels are K , L , M and N .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The K shell has a lower energy than the L shell, so the electron falls. The atom gives out energy, as light.
Step 2. (b) .
Step 3. (c) The same amount, , now taken in, because the climb is between the same two levels.
Answer: (a) It gives out energy. (b) . (c) , taken in.
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