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In my chemistry textbook, the chapter "Structure of Atom" deals with the old Bohr's model and the new Quantum mechanical model. But when I read the contents of the new model of atom, there were terms like energy levels, shells being repeated. I failed to understand the context. Moreover, Bohr's model has been discarded so why do we still talk about energy levels/ orbits in an atom?

Basically, I want a satisfactory explanation of these terms: energy levels, orbits, sub orbits, shells, sub-shells, orbitals and principal quantum number in accordance with the Quantum mechanical model of the atom.

I tried to understand this from two other books but there too the distinction was vague.

I also read the contents of:

Is there a difference between energy levels and electron shells?

https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms#orbitals-and-electrons

PS: Please provide an answer keeping in mind that the questioner is a Grade 11 student.

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closed as too broad by Mithoron, Jan, Todd Minehardt, airhuff, pentavalentcarbon Jun 24 '17 at 3:37

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ There are no orbits, suborbits, and subshells in QM. $\endgroup$ – Zhe Jun 23 '17 at 13:08
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    $\begingroup$ What is the problem with the common QM definition of shell, subshell etc? $\endgroup$ – Greg Jun 23 '17 at 13:12
  • $\begingroup$ So, does the book not provide definitions of those terms? Or are you confused about those terms? $\endgroup$ – Jon Custer Jun 23 '17 at 15:40
  • $\begingroup$ @Greg I can't tell if that comment is directed at my comment or the OP. $\endgroup$ – Zhe Jun 23 '17 at 20:51