شرح درس
Quantum numbers
CHEMISTRY - Secondary 2
In This part we will study:
 The subsidiary quantum number (l)
(a) It is given the symbol (l). It determines the energy sublevels within each principal energy level.
(b) Each principal energy level consists of a number of energy sublevels which are represented by integer numerical values range between [0: (n -1)], and their number equals its principal quantum number.
(c) The energy sublevels take the symbols and values as shown in the following table:
The following table represents the relation between the principal quantum number (n) for each energy level and the number of the possible values of subsidiary quantum number (l), where [(n) value= the number of (l) values] :
 It is observed that there is a small difference in the energy of the sublevels in each principal energy level.
 They can be arranged according to increasing their energy in the following order:

Examples
 What are the probable (l) values when (n = 3)?
Solution

 Mention the sublevels which exist in an atom of a certain element, knowing that its last principal level is L

Solution
The principal energy levels exist in this atom are K, L

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Best wishes to you
Mr.Ahmed Elbasha